This canopy was constructed from 1/8" ABS plastic sheet, which was textured on one side.
Cuts were made with a utility knife, and/or sheetmetal tools.  Adhesive used was Loctite Quicktite superglue.
The reflector for the short term is simply aluminum tape, with the intent of making a specular reflector.
I cut the rear of the OEM canopy off, but kept the front "bow" portion intact, for the time being they are loose on the top.

Top view, prior to installing lamps
 

Dual 32w lamps installed

All ventilation is through the back of the canopy, with air forced in with 2 1.5" DC fans
 

A shot of the rear, showing the recessed back which allows room for the HOB filter to stick into the tank.
Between the rows of vent holes is a piece of window glass, to reduce evaporation