Having finished watching Barbarians recently, I've gotten the itch to try to making my own Roman style muscle cuirass since the off the shelf ones suck and I'm poor and getting one custom made is out of the question since I'm poor. So, my idea is to use either a base of craft foam or some vinyl that I used to make a Greek linothorax ages ago and use expanding spray foam for the muscles. The idea would be to draw out the shapes on the base, maybe add some pieces of foam to give the spray foam something more to grab on to, then once the foam is dry, sand it down to shape. Does anyone know if this would work? Is spray foam shapeable/sandable when dried?