POST IT AS A JOURNAL.
Even posting it as literature is still less braindead. Nobody cares

That's a mighty large ship indeed, not sure of any design programs off hand though but I'll ask a friend or two that tend to dabble in such.

That's a HUGE space-ship indeed.
I would overthink some datas, like the life-support of 3,5 billion souls. (Or are they smaller than a human?)
Also the outer skin/hull sounds a bit too much. Or is it a soft and flexi compound, simular to a sponge?

The shape is nice and fitting, but as said, maybe a bit too huge.
That would be a smaller moon in mass and size, compare to a space-ship.
Or a mobile Star-Base (like in SpaceEmpireV), but even those can't handle so much souls.

Has this starship any kind of protection? Or only its skin/hull?
How many matter must the 'mouth' collect to keep the ship moving?
And how big is this 'mouth'?

There are many more questions but I think this should all at first.
If you like, we could get more into the details later.

The Dragon's Claw is small according to the Terradynnians. Their homeworld is the size of our sun.

The hull is stronger than one would think as the metals are infused with star crystal, which is the remains of long dead stars, making the hull nearly indestructible, she does have defensive and offensive capabilities (blame Black Panther's suit for the kinetic idea). The Terradynnians are on average the same size as humans (ranging from .5m tall to 80m tall depending on the species).

The 'mouth' is huge 160 kilometres high and 200 kilometres wide. There are ventral vents that help in collecting gasses and dust to use both as fuel for the engines and for water and air.

Okay, then I will start to ask some details, to get a better picture of your ship.

1. Are there hospitals, jails, firestations and militar-units on board?

2. How about restaurants, gyms, simular sport-areas, parks, theaters or wellness-areas?

3. How works the air-/water-recycle system? And how big is it?

4. About the engines, how much speed can it produce? How much full and what kind of full it use?

5. How big are the cabins for the crew? (From the 2m till 50m size.) How many can live in one cabine?

6. What kind of defence has the ship? Magnetic-fields? A Light-Reflecting-Hull? Defense-Laser against smaller objects?

7. How about the life-support? Are there one central or many for each sector of the ship?



I know a LOT of questions, but with each answer the picture gets clearer, how in such a small ship fitts so many souls.
(3.5 billion still sound a bit high for me. But maybe the infos help to understand it better.)

1. Are there hospitals, jails, fire stations and military-units on board?

There are Medical bays all over the ship, there are no detention centers on the ship due to penalties to crimes get progressively harsher up to getting forced into slavery for repeated offenses. Just to clarify Terradynnian society does support slavery and there are two types of slaves, Udai are those whose lose their freedoms due to committing crimes against nature, civilization, violating the planetary covenants and the Nareh, those citizens who once they attain the age of majority (50 Terradynnian years or 200 Terran years) choose to live under the control of someone else either for a contracted period or for their entire life (depending on their species average lifespan).

All Terradynnians are well versed in military tactics and fire control.

2. How about restaurants, gyms, similar sport-areas, parks, theaters or wellness-areas?

The main hydroponics bay as well as the three smaller hydroponics bays are multipurpose. The 'dens' (living quarters) on the inner walls that have access to the bay itself and the corridors. All four bays act as air filtering and water filtering systems and area a complex and viable ecosystem that does cater to those species that live in trees and water and has many sources of live food for carnivores, omnivores and herbivores. All dens are capable of prepping meals. There are medical bays, mess halls, repair bays, supply bays, entertainment facilities and the like located in front of the main hydroponics bay.

3. How works the air-/water-recycle system? And how big is it?

All four bays act as air filtering and water filtering systems and area a complex and viable ecosystem

4. About the engines, how much speed can it produce? How much full and what kind of fuel it use?

The engines are able to produce the gentlest of thrusts and get the Dragon's Claw up to a Warp 15 equivalent via time dilatation wormholes and are powered by a small contained blackhole that is fed with the dust and gasses that the ship collects while in transit.

5. How big are the cabins for the crew? (From the 2m till 50m size.) How many can live in one cabin?

All dens can house up to 25 individuals and the dens can be combined to house even more needed. The largest species on Terradyne which are dragons, rarely travel off planet in their feral form and will travel in the anthro firm that is an average height of 4.5m

6. What kind of defense has the ship? Magnetic-fields? A Light-Reflecting-Hull? Defense-Laser against smaller objects?

The ship's hull is equipped with offensive and defensive kinetic weapons, the defensive system is reactionary and the offensive weapons are either reactionary or can be controlled from both engine rooms or command decks.

7. How about the life-support? Are there one central or many for each sector of the ship?

The life support system is self contained and operate on it's own with an independent power source.

I misread that as 600 meters long the first time, thinking; oh that's not too big.
600km. Okay... this is what we would call a world ship. You may be further ahead approaching this with a map maker program rather than a ship builder one. Especially with the sort of distances that would be involved.

Personally I use Autocad for just about everything, but as someone who cant into 3d I've only used it for 2d designs and cross sections.

Agreeing with Slifer that the exterior sounds far too thick unless it's flexible in some way. That or its a multi-layered exoskeleton with gaps and such.

If you're only going for external design of it, Sketchup is a simple enough modeling software to get the basics of the design together, and was my absolute favorite until the heaps of garbage known as Trimble ruined it by making it a subscription service. I saved the Mac and Windows Installers for the last truly free version of the program that you can actually install on the computer. You can download them from my Google Drive here: Sketchup Make 2017.

I would also recommend modeling it in sketchup at scale, as I've crashed it multiple times trying to do something even a few kilometers across.

E.G. 1:10,000 scale is 60m length, 18m depth, 23m beam (sans wings), 34m beam (avec wings), 5m tapered to 1.5m wing thickness, 1.5m thick hull. Micro sized Talons would have 10cm length, 5cm depth, and 7.5cm beam, and Micro sized Feathers would have 5cm length. The hydroponics bay would be 30m long, 90m high, and 18m wide, and the smaller ones will be 4m high, 6m long, and 8m wide.

If you want to do internals at all, you will want to create multiple files for each section you're working on, such as one file for the bridge, one file for each variety of den, one for the galley, etc. Similarly, if you want to design a vast interior space that is massive and largely empty, consider scaling it down.

As far as the design for the Talons and Feathers, you can probably manage to do those at 1:1 scale. Just make sure to do those in separate files as well.

All in all, I'd propose a Folder structure like as follows:
- DragonsClaw
-- Complete
--- Talon.skp
--- Feather.skp
-- Exteriors
--- DragonsClaw_1-10000scale.skp
-- Interiors
--- DragonsClaw_Bridge.skp
--- DragonsClaw_CaptainsDen.skp
--- DragonsClaw_LargeDen.skp
--- DragonsClaw_MediumDen.skp
--- DragonsClaw_SmallDen.skp
--- DragonsClaw_SoloDen.skp
--- DragonsClaw_Galley.skp
--- DragonsClaw_ObservationBay.skp

Drop  NezumiYuki a line. She's good with large ship designs. :)

Hello hello, Ainoko, I believe  marmelmm referred you to me regarding what I use to make starships with?

I use an old freeware version of SketchUp, version 8 I believe, and I’ve used it to make all of my Yamato and star wars themed ships seen in my gallery.

I believe someone has commented that they have sketchup on their google drive somewhere above me, and it’s likely very similar to the old version I use. SketchUp is very flexible, the UI is intuitive, and there’s tons of guides and tutorials on YouTube to get you started.

I would suggest doing a simple search on YouTube for SketchUp tutorials and follow along and once you get the idea of how the app works, you can then plan on how you would like your ship to come together, and with a little experimenting, you may find building your whale rather easy. :D

Wish you best of luck!