I've seen some pretty spectacular examples where people did this. I think you're better off approaching heating as if it were any other wood or PVC vivarium, in which case you're going to have much better luck with overhead heat sources. A UTH heating through a wooden shelf is going to be massively inefficient. Radiant heat panels are one option. You can also use a CHE or other heat lamp mounted inside the vivarium, as long as it has a mesh cage around it for safety so the animal can't touch the CHE. For whatever reason, it seems that RHP's are more common in the US, and CHE's inside mesh cages are more common in the UK. But even in the US you can still buy or make a cage like that, they're not complicated.
A CHE inside a cage takes up more headroom than an RHP, so that may be a consideration depending on the configuration of the cabinet you're looking at.
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