Octagonal UFOs for sneaky Greys (or anyone else, just remember to wear the daft mask with clip on wobbling eyestalks) to ride around in & try out their Ranged Anal Probing Devices on unsuspecting victims.
The inside is accessible through an easy lift off top.
Pack includes open & closed hatch options & the ramp. Might do version with a simulated float field system
Two Versions available:
As someone suggested, can also be suitable as a Colony Habitat.