Going to be building a 6x3x3 for my reticulated this weekend and looking for advise. I saw a video using styrofoam insulation for the walls and floor but I was thinking plywood since its cheaper. What would you recomend and how would you go about sealing it? Also my friend wants to build one but he is thinking dry wall since its cheap and sturdy. Is this safe for snakes or would it need sealed too?