I'm interested in your progress. I am still debating on the perfect install spot for the RHP to keep the ambient and cool side from dropping too low (know RHPs don't control ambient but I am hoping they will do a little like a CHE). How gets cold in the winter and around 75 in the summer so I need the RHP to help combat the cold. Definitely going to use styrofoam for the bottom but never even thought of the top.