Dunno if this one is possible within the game framework since I assume craft sprites are meant to placed at a [0, 0] between the 4 tiles normally, but it just occured to me I might actually do Primal Hunts and use a ground vehicle from time to time if I didn't have to waste a Hangar on them.
Hence, would a 1x1 [Garage] facility be viable for that purpose? It would give +15 Workshop Space and +10 Storage too, as garages are nearly always used as work and tool spaces. And make it so that it could accomodate other, later, clearly small things, like the Zubrin, Hunting Party, and the Delorean/Titor.
Heck, in theory, a Little Bird can fit in a 35 Ft. long x 7 Ft wide x 10 Ft tall space.

Prerequisites [Car Parts], [Smithing], and [Inspect Machinery].
It would also go into that gap you might normally have with the hangars and access lift when optimising a base for a defensive layout, since yes of course it would be an entry point.