Old, off-road three wheelers are getting considered to be vintage these days. There's a ridiculously LARGE following for them, and are wildly popular. The demand is actually increasing for them. Parts are pretty cheap these days, and there's so much aftermarket for them, you can pretty much build one from nothing but a frame. These photos aren't my personal work, but this is exactly what I do to them (same quality of the builds)
Basically, I take extremely beat up variants of these:
and turn them back into close-to showroom quality. Money can be made pretty easily, and they are very easy to work on.
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They do get pretty involved, and can take several months to complete. They are full, frame-off resto's. You tear it all the way down, sand blast the frame, have it powder coated, and rebuild it all the way back up so it performs as new. Depending on the budget or condition of the engines, they may or may not be rebuilt. There are many other models and brands that I do but those are only a couple.