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It depends on what type of lighting you're putting in there. CFLs? T5s? MHs? Go from there. Should be relatively easy to build with a few 1 x 6s, screws, and hinges. Paint the inside flat white, coat it with polyurethane, and you're done.
someone else just asked about building a canopy as well. I posted a few pictures of the one i am going to build. don't know if that is what you are looking to do or not.