The skin is a standard banjo head. Its on a metal rim. On modern banjos a tension rings sits on that and get pulled tight by hook tensioners on the outside of the pot. On this one the head gets pressed down over the cake tin/tone ring by the top bit of wood. Extra tension for final tuning will be from the grub screws that can push the tone ring up a little bit more if required. Traditional mountain banjos would have a natural skin. Usually goat but I have even heard of cat being used. Its tacked on wet and as it shrinks dry it tensions up. Anyhow I did not have a goat or a cat handy and the modern head is not at the mercy of humidity changes like a natural skin.
The neck does attach to the tenon so will screw on like a bolt on guitar neck does.
Regards
John