Ok so i have never casted anything, or used foam to make a form. I just got in a brazilian porcupine and a juvenile wallaby. I have to use both carcasses to cast forms being i cant get forms for them. I also have to ship the carcasses back to the owner for maceration when im done casting. I have no clue of what to use to cast, and what type of foam to use or how much. I probably wont be separating the body parts, and will be casting the carcasses whole. I was thinking of using a plaster for casting, then a two part foam for pouring the form. The porky is about half the size of an adult american porky, and the wallaby is about 2 squirrels . Would 2 quarts of foam be enough, or should i go with a gallon? And any tips what so ever from start to finish would be greatly appreciated! Thanks!