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Looking good so far! I can't wait to see how you aquascape the tank. The step by step for hanging the lights should really come in handy for me and probably alot of other people in the future. Thanks for documenting that so well.
I noticed in your first post that you plan on keeping Rainbowfish with your Discus. I don't think that would be a good idea, as I don't think they would appreciate the constant high temps that you need for Discus. This site:
Temperature (excellent Rainbowfish info, by the way) says that a temp up to 24C (~75F) is best for aquarium kept Rainbows. For breeding you can raise that to about 28C (~82), but that wouldn't be a temp you'd want to keep them at constantly. Also, Rainbows are pretty active and would probably stress the Discus out.
I'm no Rainbow or Discus expert, but that is just my thoughts on mixing the 2. Maybe others have done it successfully without any problems with Rainbows at high temps, but I personally wouldn't mix them. There aren't too many fish that appreciate the high temps needed for Discus. Cardinal tetras and Rummynose tetras seem to be 2 that are mixed with Discus most often.