Want to go Bio for Taiwan Beauty

[poomwah]

I would like to build an enclosure for a taiwan beauty.
I started by just wanting a natural looking environment for him/her (don't have the snake quite yet), but the more I look into it, the more I like the idea of using bioactive substrate.
I will have LOTS of questions, but I'll start with just a couple. I will obviously need lighting for the plants, but lighting for heat will be impractical for the setup I have in mind.
I want to use flexwatt, but from what I've been reading it will be a problem getting the heat through the drainage layer. Would there be any problem building the heated area without a drainage layer?

Also, when obtaining plants, dirt, leaf litter, plants, wood, etc, how do I keep from introducing parasites?
Thanks everyone.