The original Fly was an engineering masterpiece, especially for its time. Could it be made today, easier and for less money than in the '90s/early-'00s? Absolutely. Would be interesting to see a company like Aristides take this on, as they regularly deal with composite molding.
I will say, re-gluing the frets on those old phenolic fretboards is a crazy process that's not for the faint of heart, so that aspect could probably benefit from a newer construction method, but Parker really brought SS frets into the mainstream, IMO, followed by Carvin.
Funny enough, PRS still hasn't figured out how to do SS frets. I'm utterly blown away that PRS didn't even pursue that option on this new Chleo model. I'm sure Herman Li would've gone with SS if given the choice.