Where to get Clear, Plastic Tubs? (Are these Big Enough?)

[Konotashi]

A second idea is plastic enclosures rather than rack system, they are easier to heat and look better, cleaning is about the same (or easier) and less battered elbows trying to climb in a rack.

I thought those were like the stackable cages? If not, I'd go that route.
I'll have to look up building plans for those.