Interesting was the 1966 Banshee Show Car code named XP-798. This was JZD's concept of a "Mustang Fighter" with all-wheel independent suspension, a 421 V8, and fold-down rear seats. The doors have flip-up panels on the roof augmented the passenger doors.
The Banshee was never shown to the public: GM President Cole thought it would eat into the Corvette's market share, and Chevrolet was developing the F Car, which became the Camaro/Firebird. One could guess that the doors of the Banshee made their way into the design parameters of the DMC-12 in 1975, but there was no mention of this. Note that in 1988 the Banshee name was revived by Pontiac into a Show Car to demonstrate a Firebird for the 90s, so any references may get confused here since the 1966 Show Car was never shown.
Source: Eric Friedebach
