Time to resurrect this old thread, almost 1 year later...
We have O'Neill colonies now, although sadly no Mobile Suits. However, there's plenty of spacecraft in the Universal Century universe to keep us happy.
Through a daring intelligence operation deep into Feddie territory I have obtained some imagery (OK, I vidcapped some episodes, don't shoot me) which could be of help to interested developers.
This, for starters, is a civilian freighter use by Zeon pilot Bernard Wiseman to smuggle a disassembled Kämpfer MS into the neutral colony of Riah (MS 0080: War in the Pocket).
It's a bit of a cross between
Space: 1999's
Eagle Transporter and
Star Wars's
Tantive IV Alderaan transport (the Tantive was itself based on the Eagle), with 4 cargo holds inserted horizontally into the main structure.
This should give some idea of the size:
Cockpit view:
The vehicle is crewed by two in a side-by-side arrangement.
If anyone is interested, I'm collecting some more imagery of different ships and vehicles (apart from MSs).