I found this rather interesting: This is Vault 22, from New Vegas. However, if you look closely, you can see a very faint '101' in the middle of the red strip where the vault number would go. It's probably because the texture was recycled from FO3, weird that they didn't change the number though. Also strange that there is one door with '22' on it at the entrance, yet it is not used in the rest of the vault. Also, not pictured, Vault 22's door actually has the number 92 on it. The 9 is half covered and looks like a 2 at first glance. Vault 92 was also in Fallout 3, the vault door uses the same texture. It seems as if V22 was sort of rushed, since all other vaults (3,11,19,34) have their respective textures for vault doors and, IIRC, the numbers on the inside doors too. V22 is also the only one with the '101' on the doors.
I think it's a bonus unlock from completing the game, not an actual story element. EDIT: Actually it looks like it has the cutout rear, so I think it's the Magnum Opus with the interceptor-like body, not the real thing.
nah, the wild hunt has the tailcone redone, no taillights or anything, and the Interceprot has the trunk cut out, there just aren't the gas tanks in there. Dunno why.