A good friend of mine has a brand new model 1495 pelican case that he's selling me for VERY cheap. Ive been needing a lockable case anyways for my NFA stuff and this will work perfect. Only problem is that it doesnt have foam in it. I like the thought of having the foam cut out in the shape of my gun/suppressors so they dont move around inside. I know the pick and pluck foam sucks and falls apart so Im wondering if I could fill the case with Great Stuff Foam and then cut and dremel out the exact shapes of what I need. Ive never done anything with great stuff except shoot cans of it so I dont really know if it will work. Will it be all crumbley and little pieces get all over the place, or will it be too hard?