Removeable Parts

Youshould post it up on the realm I usually use revoltechs but I would love to see it.

That would be awesome!!!

I just remembered I have a tutorial on how to do that if you would like me to find it.

Why not just make your own ball sockets. All you need is Aves (or green stuff, etc) and some ball bearings in the desired size. Attach the ball bearing to one side, then hallow out the other. Stuff some Aves into the hallowed out piece and then insert the ball bearing side into the Aves. Then just move the joint through the desired range of motion. Once it dries you have a ball socket

If it is a head with a ball socket situation, fill the socke with aves ( or green stuff or whatever) then make a peg out of the neck ball. Hust shave the ball down till it is a long peg. Note a peg to small will snap. Garunteed afteryou are satisfied with the leg I sand it till its resonabuly smooth. Then drill a hole into the dryed material. And test it with the peg. Once it's about were you want it. if it's not snug enough use crazy glue to make it snugger.
In case you are not sure what I mean. Cover then neck leg with crazy glue and insert it into the hole
and just keep spinning the head on the neck peg as the glue drys it will get tighter. Do this until you reach the desired effect. Hope this helps!

It's harder/trickier to do than a peg, but you could separate the forearm and hand from each other with a purposely jagged cut so that they can reattach to one another like puzzle pieces (think a tab and slot kind of affair). The hand isn't likely to be able to hold much weight before coming unattached with that method though, so heavy accessories would probably be out.

Like the previous posters said, pegs are probably the way to go if you don't want to mess with magnets.

you can drill a hole and sculpt a peg, using superglue to if the hole is too big. If you don't like the magnets for the scratches that can accumulate, simply sculpt thinly over them.

Screws are quite good for small stuff like hands (I used some on my recent tri-clops), just get one with a head that doesn't quite fit in the peg hole but will with a little force.