This sketch collage quite literally only focuses on the appearance and variation of my Cargon species, and now I've made the cartaur a pretty common form among all my cargon variations.
Eventually I'll use these illustrations to make a proper species ref sheet which will most likely be multiple refs to try to explain everything in depth of their appearance and what natural abilities they have as being both a vehicle and a dragon.

Short info ref:

They way my Cargons transform from dragon to vehicle is turning their dragon mass into a semi goo (non dripping and doesn't get stuff wet) form that then gets stored inside a hammer space within their soul. They can also reform part of their dragon mass into an anthro torso on the hood of the car directly above the front wheels or reform as a human sized dragon anthro "driver" inside of their cabin to appear like they're driving themselves but can't leave their vehicle body. The driver form is very soft and pliable.
Their gooey nature also allows them to easily swallow items to put directly into their cabin and trunk, and selectively spit specific items they are carrying out. However if the Type C cargon transforms to dragon form while having items inside it's trunk and cabin, that mass gets stored within their dragon mass as layers of fat along the belly and rump. but the ability to selectively swallow or spit out items remains unchanged.
Gender differences between male and female cargons are very slight in the dragon forms while the full car forms virtually have no visual gender difference.

And for a bonus on the top right corner, I've decided to include Flyro holding a dolphin stuffy to fill in the empty space left on the canvas after I've made all the sketches I needed for the Cargon appearance ref.

Cargon species, Flyro The Dragon Wagon, and drawings © me  jeff_dragon471