Troughs are AWESOME! I used them for my monitors and tegus. I just cut plexiglass to fit the top, hinged the center section and screwed in a porcelain fixture up under the stationary section of plexiglass. (screw the plexi on the stationary half with screws to the edge of the trough) You can drill small vent holes or drill a 3 inch hole and cover it will a drain cover. (Home Depot) Use a 45 watt Halogen flood lamp and 6-8 inches of mulch... PERFECT!
The humidity is easy to maintain, easy to clean and they last forever. I never had trouble with tegus climbing or getting out.
Good luck,
Jeff Houston