I've spent quite a few hours already building the fiberglass base to the point of being ready to wrap. It is 3/8" to 1/2" thick all around, I know, probalby overkill but here is my dilemma. I need more air space. What you will see in the pic is what I want to know if I can do. I have the stuff on on the left side of the pic already built but I need more space. Can I do this? Thanks for you help!