My rat rod design from the mid-1990s had cantilever airfoils to replace the VW front torsion bar suspension. There would have been flat plate connecting rods [not shown].
The back was a combination of narrowed track, bobbed tail and a virtual rooster tail of hot air out the original rear window area. I [possibly later] learned it would be configured as a Coanda nozzle by adding a visor/mini Kamm-back.
Today I would balance the Kamm-back with a similar shaped splitter in front. That picture was taken with my first digital camera in 1994. Today a Stable Diffusion AI inpainting could up-res it so I could modernize the details. Hmmm....