Great work you're doing on that torso, rvb. Those HD Pep files really make it a helluva lot easier for details, don't they?

lol
As for your intended permutations, aside from using buckles, here's something else you could try:
Once you've resined/fiberglassed the armour pieces that will include permutations, using a Dremel tool or something similar, drill out small holes in key places (namely, the corners where the permutations will be attached) and insert small rare earth magnets.
Make sure to glue them in place well (it would probably be best to use epoxy to secure them), and then putty over/sand them smooth so when painted, they won't even be noticeable.
No need to worry about the strength/effectiveness of the magnets, even with a layer of putty and paint over them, as earth magnets have a very strong pull to them.
Of course, you'll then have to put opposing magnets in the same spots on the permutation pieces.
That way, you'll be able to wear the armour with or
without the permutations, and it'll look good either way.
Just a suggestion for you to consider, anyway. Believe me, I've given this design aspect a lot of thought, lol.
I plan on doing the same with mine, as there are a couple of permutations I'd like to wear on mine, but also want to have the option of being able to wear my armour without them should I choose to...
