Hi, I'm Sean (Dockery07's husband).
The canopy was buit by using 1"X6" finish boards assembled in a box formation and re-enforced. I put 3/4" plywood on the top to secure, and mounted the lights with polished aluminum to reflect the maximum light. Box fan's are also mounted in the top to remove heat. 4 fans, two directing air up, and two directing air down.
The edge is crown molding from any home improvement store that when put together finishes the 6" piece (Cuts were not as easy as I first thought, so buy some extra). Crown molding was also added to the top to hide the fans, mounted to the top. The canopy is secured to the frame that surrounds the tank via a piano hinge.
Lights are turned on and off by a microswitch so when you open the lid, you aren't blinded
Maybe that's too much information, if you want more then just let me know. just about all of it was built from hand with common tools.