I made an attempt at a banjo.
That's pretty sweet, but a few things are bugging me. I play the banjo a bit myself so I'm noticing some proportion errors.
1) The peghead is too small relative to the neck. Perhaps if you made the neck taper down as it nears the peghead, it would fix that issue.
2) The neck is way too long. The neck and peghead combined are rarely any longer than twice the head.
3) That metal thing at the bottom, the tailpiece, connects to the bottom edge of the banjo. It can be any size, but it's never disconnected from the edge.
4) The pot of the banjo is way too thin. It should be about as thick as the resonator.
Fix those proportion issues and it's golden.