So I wanna get some more mechanical experience. I do my own work on my GP but I wanna try finding some beater on craigslist to work on and have something cool, while simultaneously gaining mechanical insight. Can anyone here give me advice on what I should get? In the end I'd like a fun project but when I'm finished I'd like to be able to sell the rig and not lose any money on it; I don't have much to begin with.

Projects I've considered:


Any of these sorts of things worth my time or would I be throwing away money?