If you REALLY wanna do it right, ditch the whole glass fish tank idea. You're starting off with an enclosure that was never meant to house reptiles. Then you're trying to make it into something it's not by covering 3 sides, and putting some ghastly-looking foil treatment on the screen top.

I'm not trying to be mean. My first ball python lived in exactly the enclosure you're describing. I'll give you the advice that I wish someone had given me before I ended up with glass tanks all over my house...

http://www.boaphileplastics.com/322d.html

Light-weight, non-porous material that's easy to clean, stackable - so it can grow with your collection without taking up more space in your home.

Jeff Ronne will build your cage and install whatever options you want with it. Flexwatt heat tape, florescent lighting, radiant heat panels, latches, key'd locks, or whatever else you want. When it arrives at your house, set up is as easy as plugging in whatever electrical stuff you asked for.