I've found a few reference photos for each of these online. What sort of foam would be best to use to build from? I've really only ever used puzzle mat EVA and craft foam; could those work, perhaps with a topcoat of some sort to provide rigidity? If so, what top coat? Also, are there any decals for the ammo counter and scope displays? Part of me would love to try and rig LEDs into the gun to light them up, but I don't have a program that I can use to design a decal myself.