Hey guys, I'm sorry to post this because you must get so many of these types of messages but...

I wondered if you would give me your opinions on this tank set-up before I start buying things, I also have a few questions along the way. All constructive comments would be greatly appreciated. Thank you.

TANK
I was going to build the tank as such:
Front wall - glass - for viewing (obviously)
Bottom - glass- to conduct heat
Side and back walls - plastic - to better trap heat and humidity
Size = 20 gallon long ( 30"x12x12 LxWxH)

LID
Same as this one http://www.ball-pythons.net/forums/s...ad.php?t=32800

HEATING
150w red bulb with dimmer switch
2 heat mats connected to dual thermostat
* What size heat mats should I use for a 20G tank ? *
I will also add a digital thermometer and hydrogemeter as well as trying to acquire one of those lazer temperature reader things (sorry don't know what there called lol)

INSIDE
For hides I was wondering if I could use two of these: http://www.exo-terra.com/en/products/reptile_den.php
but would these fit a BP? Apparently the specs of the large den are 10x5x6 however several sites give different proportions so i don't know?
If not however I was thinking about one of these:
http://www.exo-terra.com/en/products/snake_cave.php
Again not sure on size? advice?
I will also add some sort of water source and a log.

That's everything I can think of right now. So thanks in advance. If theres anything I've left out or you can answer any of my questions, please leave a message.

Stevan