I have used different tubs in the same rack before. It is a nightmare configuring the heat cable so that the hot spot in the shoe boxes is the same as in the sweater or CB70 size tub while not running out of cable or having tons of excess. If your snake room doesn't circulate a lot of air, then you might find that with the same amount of cable per level, the bottom tubs dont get nearly as warm as the top ones. You might have to gradually run extra wire per level as you move down. It takes forever to get it just right but if you do I guess it works better than other racks that cannot be customized.

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