Hey, first post here. I want to build a big artic dio, for both Joe and Cobra. I'm thinking about a 4' x 8' area ( Ill probably build on a sheet of plywood). I want to make hills, caves, mountain peaks, trails, evergreens, maybe a lake (blue plastic?). So what are the best materials for making snow, ice, mountain terrain, buildings ( HQ and Fortress) (styrofoam?), and all the rest. Ive never made a custom figure or dio before so Id love advice on every angle of this. Should I look for a certain book that would help me on this? Thank you.

Ryan