Good job, but maybe put some duct tape over the sharp edges for safety.

I just made a hood out of wood, plastic, and mylar for dual 400 watt mh/hps lights for about 5 dollars, so we're both on the cheap there. I used the 2' x 4' plastic sheet that's used to cover fluorescent fixtures, elmers spray glue, duct tape, mylar, a scrap of 2" x 6" treated lumber and a few screws.

I tested it last night to see if it would get hot. I put my light 4 inches from the mylar, which is closer than it will be when used, and after 20 minutes the mylar and the plastic were both cool to the touch. I'll be nervous using that for a while, but I'm not paying 130 dollars or even 39 dollars for a professionally bent piece of metal that's no better than what we can make ourselves.