In the next few months I'm going to building a rack. I want to make it 3 tall by 2 wide with smaller ones on top of that for my sand boas. I'm going to use separate stats for them because the smaller ones are for my sand boas. So for flex watt I'm going to put it at the bottom of each section towards the back, what size should I use? Also will 10g tubs work? There about the same size as I think 36q but a little bit taller. What kind of board should I use? I'm going to make it big enough to fit a 75g tank on top that houses my blue tongue skink. Also since I keep it about 65-68 in my house would putting a curtain on the front be okay to trap some of the heat in? Any help would be much appreciated.