Did you cut the 1/8 sheets to provide a 1/4 space between each tub and shelf. Like you added them, screwed in then removed to ensure there was a gap. I just ordered 12 snakes and I want to build this rack. Could I make a 12th shelf and still have enough heat tape. Also since I am getting few month old snakes. Can I use the 411 with a divider in them so they don't get stressed from too much space. Do you only need one thermostat for the whole rack. Thanks for your help.