I do love a good oddball of a car. These two interesting customs are currently available on eBay. One has a some history on it and the other seems to be of unknown origins.
A trike created from a surplus belly tank? Fantastic! Powered by a Triumph motorbike engine with some interesting custom front suspension.
I might like this aero inspired bird cage car even better. Its definitely got a neat exoskeleton look that is quite popular with niche sports cars these days, most famously the Ariel Atom. Interestingly it features two transmissions paired with a two cylinder engine. I would love to see more detail on how the drive train works.