If anyone is looking to build a Lemon, sage advice it to start with a very popular car. Not just because they're cheap and parts are plentiful in the salvage yards, but because there are likely to be half a dozen teams AT the race with parts that you might need.
Show up in an old Peugot, and you might win the Index of Effluency and get lots of attention... but if you break, you're screwed.
Show up in a Honda Civic, or an BMW 325 or a Neon or a Fox Mustang. Something that's common AT the Lemons races. Unless you're bringing a complete parts car, you really don't want to be in a "unique" Lemon.