The starting point is 3d solids in Turbocad. I started by making some throwaway test pieces. These were things like solids to fit the doors, and a test deck. Then I made supports to get the height right.
The main limitation is the size of the printer. I made the hangar in four segments to fit the printer. There are 6 supports underneath. I have one that wraps solidly around the bow, one more loose at the stern and one at each door to match the floor to the openings.
Not shown above are structures for the front and back. I still have to make the roof. Need to measure for the steel bars from the kit
The big challenge here was measurement.
I hope to be able to build some full ships. I am working on a 1:192 New Jersey.