Well, I don't see it
not being a possibility, the problem is there are wrecks of other Garlean cars strewn around the ruins of Garlemald and... they're not very big! A mount has to be able to also open to show your character (this is why the folding roof the Regalia is meant to have doesn't work) in order to fit roegadyn and hrothgar characters who.. would kind of dwarf it, although I guess they could handwave it away and just have your character disappear into it like the Lunar Whale.
A final point that is that there would have to be some way of making it
fly (as all mounts fly now), and, I guess some magitek 'upgrade' could me made to make them fly, this doesn't seem to be ironically an option the actual Garlean ones have!
Still, ignore my nitpickings, it would still be fun to get!
