Artago
181
Acrylic
Purely from a technical perspective I'd agree as far as acrylic goes, that would be a significant concern and THE showstopper.
For gaskets/seals I belive it should be possible to get the right shapes, dimensions and compounds (softness/hardness) to seal them, but I'm not sure how that goes with "matching numbers" or history? I always picture gaskets as consumption parts, but am aware that it is of significance for vintage cars.
Don't get me wrong, important pieces like these don't need exposure to risk, thus let me put it in a different way, if there were 300.000 of these available, they would be fine for diving 🙂