Here's just a one shot of the 3 shuttles i have, the one in the back is an old cargo/shuttle i modeled for the GAF and the Rebel faction in my universe, the other two are the ones for the little design challenge thing going on over at  management_9 I don't know how my model will fair compared to the others but the design of the first two ships i had been wanting to try out for a while.

Its essentially a tug and sled kind of set up. The pod at the front on the first one is detachable and can maneuver about in the chance it has to dump the sled in the chance the sled is damaged and has to be abandoned. The second is the same way but has no propulsion pods on it, relying on a mechanized arm system to guide it into place and lock it up with the sled. In the chance the sled is damaged with the second one it detaches itself and sets itself adrift while sending out an SOS until it is retrieved.

The requirements for the Cargo ship were large but descret(sp) and fast. All three are sizable and relatively fast the first two have four propulsion pods containing two thrusters or whatever to move it along at a decent speed. The ship can be piloted by a person or left in the capable hands of an AI.

The boxs on the sled are held in place by magnetic locks and with a umbilical that runs from the sled to the tug a human or otherwise pilot can walk into sled and check the cargo, change each containers internal temperature, or whatever is desired. In dock the magnetic clamps are released and the crates can be collected from the sled.

I actually considered a ninth crate that would serve as a compartment for the human occupants to be collected from the sled as well and transported from the cargo ship to wherever the supplies was taken and the pilots allowed to stretch or do whatever they please while thier ship is prepped for another cargo run.

If requested I can do a few modifications if needed or provide a few alternate views.

Modeled in Google Sketchup 7.

Enjoy~