I attempted my own build (the one I'm using now) and it's functional...but it is not the best. I also want the PVC racks because they are not heavy like malamine and won't warpor bend quite as much. I'm having trouble finding someone in my area to teach me how to properly pop ball pythons...let alone teach me how to properly build a rack.
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I tried there...but he doesn't ship a 5 tub...which was what I wanted! So it's back to just the three tub. It's workable...just not exactly what I had in mind.