Look very nice ! Probably hard to do, but what about a version with returnable wheels ? Like the Delorean in back to the future ?
Yes, probably, but not with one of the cars that has solid axels, since it's a lot harder to do it for one of these cars. But e.g. the Bolide would be possible.
Theoretically it could go infinitive (since there are no tires that could explode), I once hit 300mph, the problem is that it's not stable at these speeds anymore...but I'm working on higher speed and high speed stability --- Post updated --- Yes --- Post updated --- Ummm...yes
I don't know, the problem is that hovercars haven't been done before, and because of that I don't know how long some parts will take. So all I've got for you is this cute bear ʅʕ•ᴥ•ʔʃ.