i'm building a rack and i was wondering why i never see them with those white metal wire type of shelves people put in closets or pantries....would this work? b/c those types of shelves are light and cheap.... i was considering building a wooden frame and then putting those kind of shelves in it. i wa going to back heat it and as long as i don't let the heat tape touch any of the metal, i don't suppoe there will be a problem with overheating or melting. does this all sound plausible or am i overlooking something? any opinions at all would be greatly appreciated. thanks. ed