So here's a tiny update, I remade the arms, because the previous ones were WAY too flimsy for fibreglassing, there was no inner support or anything. Anyway, so here's what I constructed:
It's sturdy as hell, so it can take the fibreglass and some. My first criticism, however, is that I think it's a bit too big. I aught to scale it down a touch, otherwise bending my arm will be more or less impossible. While I'm making changes, I thought I'd take this opportunity to ask you guys what you think of the arm so far:
Sketch, draw, doodle anything that you think you'd change, or you'd want to see different about this arm. Come on, I need your help here.