Love your optimism re the Coupe but it leaks.
LOL. The AeroCoupe was the solution for the roof leaking, not for all leaks (to avoid that they should have built a tank. Or a Porsche).
Ah my beloved wet windscreen... mine was leaking as well, obviously. Now, after Saint Borghi spent a few hours on it, it is fine. (well... I think that with Borghi I suffer from Stockholm syndrome by the way)
Windows are ok but yes, still some water on the lower part of the doors but only after a couple of hours with heavy rain on the motorway. Not too much I'd say.
Maybe with the Aero8 MKV they made a miracle. Who knows

I hope that a good part of the improvements (if any) can be retrofitted.
But again, if some wet inside is the price I need to pay to smile anytime I take it for a ride... shut up and take my money!