I built a smaller one way back in high school because I thought I really needed one in the farm shop. I remember I used it once or twice but otherwise it collected dust. Left it there when I moved out.
I could wish a lot of things on my worst enemy but neuropathy ain't one of them.
I used a 20 pound sledgehammer and plenty of cuss words.
Seriously, always wanted one, and tried to fashion one time, but it didn't work out like I wanted it to. I guess I just never needed one that often to get serious about it.