I've been fiddling around in Blender, putting together a Space Opera spaceship loosely based on the ship of Doctor Zarkov in the 1935 Buster Crabbe Flash Gordon serials.
Something I hadn't remembered, but which I discovered when I looked at a screen-shot from one of the films, is that the ship has a fixed undercarriage just like an aeroplane of the era.
I tried a variety of layouts for the STLs.
The one-piece model (the red one) didn't print well at all; Cura's support game proved to be weak.
The green one, split longitudinally, worked fairly well, but in the end I went with the blue one, split fore and aft, as it required the absolute minimum of supports.
The STLs are available (free) at
https://www.thingiverse.com/thing:5215636The model, as designed, is roughly 150mm long.