And if not how would you heat a home made wooden cage that is 6x2x2.
For most species I would use a radiant heat panel.
If I already had flexwatt or other heat tape I would use it to make a DIY radiant heat panel, but I won't discuss that here.
If I felt I need "belly heat" I would cut a square out of the bottom of the cage that was about 2" wider and longer than the size of heat tape needed. I would keep this cutout away from cage walls as to maintain the structure of the cage.
I would cover the entire floor with 1/4" expanded PVC which would make the floor more durable and easier to clean. Foil tape to attach the heat source to the bottom of the PVC. Shallow grooves could be routed in the floor for the cords to run through.
A PVC floor does add cost but I feel it's a worthwhile cost.
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Currently keeping:
6.10 Gonyosoma oxycephalum (Javan, mixed colors)
1.1 Philodryas baroni
1.1 Lampropeltis triangulum multistriata
1.0 Rhodesian Ridgeback