Hi Jackdp,
I've built a few of these and thought I'd just mention a few things I thought about when building some of mine.
First off - looks really cool - nice job.
It seems that the reflector is already mounted on the inside (I am not sure about this but I seem to see it through the cut out for the fan). Just wanted to suggest - and you may have already thought this out - that you should be sure to finish the inside of the canopy with whatever finishing material you are using (a good suggestion is polyurethene). I suggest this cuz I made the mistake of not doing this on one of mine - i.e. only finished the outside, and sure enough, the dampness from the tank (dispite covers etc.) managed to effect the wood.
Bottom line on this: Since it is wood used over a water based container - best to have it totally sealed.
Another suggestion - something I discovered very useful on one of my canopies - I mounted the timer directly in the canopy along with override switches which alow you to turn the canopy on even if the timer has it off. I placed switches on a strip of aluminum, routed an opening in the front of the canopy and recessed this into the front. Looks very cool and provides full control of all lamps from the front of the canopy.
Anyway - the monster looks great. Hope to see pictures when it's complete.
Tom