i like the "tadpole" ideas best. especially the VW front end, for cheap off-the-shelf replacement parts. small gas engine in the rear with chain drive single rear wheel (more labor-intensive, but easier to play with gearing). tube chassis with tabs to mount your fenders/hood/windshield/headlights of choice (miata, geo, civic, etc...) also for ease of replacement parts. under the hood is the "trunk". teardrop the back with removable panels to work on the motor/wheel. smooth belly. spartan interior. mesh seats, no dash panels, just a scanguage-type instrumentation for guages, small (adjustable) scoop under the car to channel (filtered) air into the cabin for summer driving, wear a jacket for winter.
for something a little different, what bout 2 wheels in the back, but very close together? like a traditional rwd solid axle, but narrowed to the point of only having enough room for the differential and a swingarm-type link suspension. maybe use this for extra weight-carrying capacity of a 4 seater in similar fashion of the above idea?
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