I got the doors done. Now, all I need is to cut the fan holes on the sides, and start painting and caulking the insides.
Basically, took 1x4s again, layed them out flat on the canopy. The back side supports are .5" plywood, cut with a jigsaw to match the curve of the front of the tank, then 2 glued to each other to make a 1" curved strip. Then, screwed the boards onto the back rails, countersink the screws and (this last part is cheating, my Jr. High shop teacher would be so disgusted with me), covered with wood filler to make the surface flush. (Ordinarily I would not use wood filler, but since the outside of the hood will be painted anyways, I hope I can be forgiven this last little indiscretion ...

ops:

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I am not sure when I will paint the outside. I would prefer to do this work outside, since it will be a sprayed paint, so it might just end up being primed for now, and then waiting until the next chinook for nice weather to do it outside.
(I, uh, already tried priming the insides once, all I can say is, don't start painting something at 11pm, if you're a klutz like me, and accidentally knock over the oil based can of primer paint onto your carpet, you will end up spending the next 2-3 hours desperately cleaning your carpet, with members of your household coming up with creative new nicknames for you, and so on.. ... I decided I could do less damage by working on the doors, so at least now that part is done...
ops: )