Dave,
Its really tough to say for the 3 different tubs he would need there really isn't a set manufacture that makes 3 equal hieght boxes that would fill his need. I use 3 different sterilite tubs but only the 1754 and 1756 are the same hiegth the 1960 is different.
Also the 1960 is really only suitable for full grown males, large female Ball's really need some more room. The CB-110 is a good choice for females. Of course the CB-70 is perfect for young snakes as well as full grown males.
Its really a matter of preference, sterilites are easily obtained at Target and Walmart for next to nothing and a replacement, should you break a tub is easy to find. However eventualy sterilite will stop making the one model you may need. Iris boxs are easily obtained at some places none of which are near me but also available via the web.
Iris models don't seam to change as often and as much as the setrilite or rubbermaid tubs do. However the different sizes are hardly the same height which makes building a single rack capable of different sizes difficult.
I'm not saying he needs a rack that serves three different size tubs on every level but it is the most ideal. He could easily build one rack that served exactly what he wants in his pic. Than it comes down to what tubs he wants and where he gets them.
Personally I feel that hif he needs three tubs than he should have three racks on for each type or size of tub. This is my personal preference of course, although it makes assembly and construction as well as design and implemetation of the design all that much easier.
I understand he is limited on space but I am approaching this from the view point of the builder. He indeed has the skills and knowhow of a carpenter to build what he wants how he wants. I'm just saying its easier to build all one rack all one way.
Hopefully this helped a little in my rambling about tubs.
Good Luck
-----
Jeremy
"I am become death, the destroyer of worlds" July 16, 1945 Robert Oppenheimer
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