Hi, I am new to the boards and new to reptile keeping. I have recently agreed to adopt a CWD who has a bit of scarring from a bout of mouth rot. I have never kept a reptile before and my research into care and habitats led me to this wonderfully informative place.

Unfortunately, my limited understanding at that time thought "aww, poor thing needs a home" though after purchasing supplies for it's new home my wallet is crying.
So with limited budget I ended up with a 20 long as an (soon to be replaced I'm sure) enclosure to work with. The dragon is currently only about 5 inches snout to vent so I think it will work (probably long enough to build a bigger one, lol) I really really like Grimm's vertical build in the Terra-Construction forum, and have decided to attempt to replicate it.
Just a couple of concerns I had: Will a UVB strip simply sitting atop the glass allow the lizard to get/absorb the UVB he needs to properly metabolize calcium? Obviously, I could simply put the light inside, but I already feel like it's a small enclosure for him (though I'm rescuing him from a 10gallon) and would prefer not to if possible.
Also, should I worry about heat from a spot basking lamp damaging/cracking the glass of the aquarium? What about a ceramic heat emitter?
Sorry for the wall of text, thanks for taking the time to stick with me.
