Very cool car , hadn't seen it before , it seemed to have been around in the 90's ,so hopefully it will have survived . Pale yellow works best imo !
Only place for the Corvair flat 6 motor to fit would appear to be in the front , the HAMB link mentions VW gearbox/trans flipped ,I wonder as the Corvair turns acw ,perhaps a VW trans is just reversed ,rather than turned upside down & a shaft at engine speed transmitting power back to it ,lots of engineering for sure ! Can see what looks like the stock VW Beetle front antiroll / sway bar beneath presumably a VW front torsion bar beam setup. Afaik Crown USA used to sell kits for putting Corvair engines into Beetles & buggies in the 60s & 70s ,engines were modded to run regular clockwise , or VW trans crownwheel swapped sides !
Possibly a good portion of a VW floorpan/chassis used , as the Corvairs are monocoque
Windscreen looks like might be 59 / 60 fullsize GM (Chevrolet / Buick / Pontiac / Olds ) sedan rear window