My ReptiBreeze bioactive has a simple planter box that the enclosure sits on.
Pictures of the raw box, prior to several coats of LiquidRubber (inside), 2-in-1 Varathane stain (outside), and the addition of a vinyl shower curtain as a liner:
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Full enclosure:
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Layers and drainage blueprint:
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PVC drainage access pipe, to siphon off excess water (picture taken from my 36x18x36 ExoTerra, but I did the same thing for the ReptiBreeze):
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