Here you go, three of my clone belt boxes fresh from the mold. From left to right is the lightweight resin weighing 250 grams, in the middle is a flex foam at 200 grams, and then to the far right is a rigid foam at 100 grams. Naturally, the resin gives the finest detail, followed by the flex foam. The rigid foams may be tough for an external surface because if the skin is opened up, say via sanding, it reveals the open cell structure inside. Next experiment I may try brushing some resin into the mold, let it harden, then fill it with rigid foam. Overall, I wouldnt hesitate to use wear either the lightweight resin or flex foam boxes. It's just a slight tradeoff for sharper details versus a little less weight.