Finally finished my new canopy today. I'd forgotten how much I love the look of halides!
I used the top from my existing canopy and screwed that to the top of the new one after staining and 3 coats of spar varnish. I'm using a 250w halide and two 24" 75w VHOs on here, both off of icecap ballasts. Since the ballasts don't run very hot, I felt safe screwing them directly to the canopy. I'll watch for any overheating, but I expect it will be fine.
Finally, I attached the doors and plugged everything in. Here you can see how I attached a small vertical block to one of the doors so that the canopy matches the stand but I still retain full access to the front of the canopy.
I've had all the bulbs running for about 5 hours now, and all of the livestock is noticeably more fully expanded than yesterday. I'll be on the lookout for heating issues, and I still have to decide on the photoperiod for the bulbs, but it looks like the canopy switch was a success.