Somebody I follow on Instagram recently bought a G-body Monte Carlo SS Aerocoupe, a version of the personal luxury car with an extended rear window that was produced for NASCAR homologation purposes. Around the same time, my boyfriend bought each of us a 1988 Buick Regal promo model and had the idea of a build-off for customizing them. My thought process went something like... "the Monte Carlo and Regal were both G-bodys in the 80s then a new generation was released on the W platform... Monte Carlo Aerocoupe... fastbacks are cool... what if W-body Regal Aerocoupe?"
I bought a 1996 Corvette promo for cheap on eBay to scavenge the hatch glass, centre console, and seats from, held the parts next to each other, and started hacking away. I might have done better with a slightly bigger rear window, but I think I can extend the C-pillar with styrene strip to make the lines flow nicely. Everything is just mocked up with blu-tack now.
I've cut out the trunk lid to follow the contours of the Corvette hatch.
I cut off the seat bosses and filed the centre tunnel a bit for clearance to mount the Corvette seats and console. I also cut off the interior tub's package shelf -- the Corvette's trunk floor will fit behind the rear seat instead.
A side view of the position of the rear window -- I'll close the gap with styrene strip
Top view of how everything should fit together with the new rear window and trunk floor