You are at the right place to ask the questions, this is a build thread so ask as many as you want. I personally remember the anxiety of making a wrong cut or decision, but the good news is almost every "goof" is fixable or you have the option to order a new replacement piece (and practice on the old piece). I screwed up the cuts in the calfs and had to order new pieces, but I figured out what I did wrong and the second set was perfect.
As to the hands, get out the blue painters tape (or whatever you have) and mock it up. I have wondered about using magnets to close up the sides (maybe something to think about).
Anyways, keep up the good work!
Lou