How do I heat a wooden enclosure?

[CakeLike]

I'd suggest checking out the biodude and his bioactive mix. With that mix you don't need a drainage layer so if you're going with a heat mat that may be better. Although I'm not sure about your idea of a false bottom. If there's small cracks then your heating is done and if you have a false bottom then you can't access it for maintenance or if it breaks slightly it's harder to know. You might have thought of ways around this but I'm not sure with the info you said.
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Yes the accesability would be a problem to get around somehow. But I don't really want to put the heatmat in the cage without something to seperate it from the snake, since everyones pointing out everywhere how dangerous a heatmat can be when the snake has access to it.

Unfortunately I can't use the Bio Dudes Mix since I am not from the US. A selfmade mix would be possible but I have not yet found a good recipe for a substrate to use without a drainage layer.