Also, the aft compartment of the Delta Flyer from Voyager can't fit inside the ship, and there's no actual exit door on the exterior model.
No problem with a 21m long DF. And the exterior model does have a ramp shape right where the aft door would lead.
Except of course that there's no such exit door on the aft compartment set!
As for the 7' medical bed, perhaps it is flexible and is stored vertically inside the wall?