You're assuming the Museum version is a different vehicle! Which it may well be, but I haven't found a picture of it that doesn't look curved.
I've never seen a picture where the bottom border of the glass wasn't curved. Look at this from reveal night, curved as can be:
If that were the...
Heyo, I read this and your other writeup on the suspension and got an account just to talk to you about it. I think you might be correct, with some evidence supporting and some against. It's clear from photos of the various prototypes that there's no shock tower between the wheel and bed, so...