The space is limited, ayou can use a Mini-Rig, but no Medium Vehicle.
I made some tests with the new AT-AP from the TCW Line, but the messures (30x30 cm) are little to small, you can do something but ist looks not good enough.
That is the reason why I currently work on a 30x60 cm Diorama, to include a Starfighter and a outpost.