I used styrofoam sheets as well as "Great Stuff". Once I had my shape, I coated everything in sand colored tile grout, and then clear tile sealant. There are a few build pics here http://myinnergeekhasadd.blogspot.com/2011/02/bearded-dragon-cage.html and pics of my new work in progress cage here http://myinnergeekhasadd.blogspot.com/2011/02/ball-python-cage-update.html
chris


