flex watt heating question

[Brently]

Just got a question about flex watt. I am putting together plans on making a large lifetime enclosure for my boa. I am planning on something around 6-8 feet long probably about 2 feet wide and 2-3 high. I am going to make a filtered water basin and it will have a large hollow log also. My question is if I use flexwatt to help heat the bottom of the enclosure how thick and what material will it heat through? For example if I make it out of wood how thick can it be in order for say a 2 foot or 3 foot strip of 11" heat tape to heat the floor? If you need a better idea of what my enclosure plan is, take a look at a JWORLDS enclosure and then just make it not so tall. Any feed back would be great. Also I am hoping to use a heat panel, would the combination of these two be sufficient? What is the recommended way to heat a large enclosure?