Hi Jack -
I just came across another project out there using some Metro (Swift, actually) parts as the motivating bits for a light DIY sports car project. Made me think of yours.
His is a somewhat different approach: the main one being he's going with electric propulsion. He's also modifying an
existing Ford race car chassis to take the Suzuki transaxle, axles & hubs (RWD configuration).
Below is the Suzuki transaxle mounted in the chassis:
And he'll top if off by sticking a Lotus(esque) fiberglass body on top:
Project web site:
szott.com
Probably won't be as low drag as your project, but I thought it was worth posting as brain fodder since people here seem to get a kick out of the idea of transplanting small displacement drivetrains into custom bodies.
Darin