I also use two different sizes.
My males are in 28qt drawers, I bought the rack at a show its nothing special, I just wanted to get them out of my real drawers where I keep my females.
I build my own female racks based off of a rack a friend built for me when I first started out.
The rack itself is made of melamine caulked at the seems, wood puttied and painted on the edges. It holds 5 drawers and takes two full sheets of melamine and whatever you want to use to keep heat in the back (I just use the paint to seal this surface so the melamine isnt really necessary). I put castors on the bottom for easy moving because it is pretty heavy.
The drawers are the large concrete mixing tubs you can find at home depot that measure 3'x2'x8". They have no ridges on the inside which makes cleaning really easy, they are PVC and opaque. The animals seem to enjoy them.
I keep hides in most of them but the snakes that don't have hides don't seem to mind. All in all we have had no health issues and our biggest female has put on 2300 grams in 2 years living in it so she at least seems to be ok with the set up.
I have used both flukers pads and flex watt (with soldered connections) they both work just fine though I haven't compared efficiency in any way.
I control heat with a herpstat 4 from spyder robotics.
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