just take good measurements and go at it. i have a 55 and built mine. used 1/2" pine. primer, painted, and urethaned it. also added a fan on the side for cool air circulation. sorry, no drawings or specs, but here are a couple pics:
before mounting PC & halides on lid:
after mounting PC & halides on lid:
basic shot:
took me about 2 weeks, but i didn't work on it that much. i am by no means a good wood worker, but this is fairly simple a very straight forward. good luck!
-One