Now what else? Ah yes - the framing. Wooden framing is a fairly simple process - just measure, cut, and glue. We suggest using the lightest wood you can find to avoid any potential danger to your LCD screen (but not particle wood - duh). Just be sure to cut those angles precisely and take those measurements twice to ensure a very snug and fit box.
Luckily, since it's only the TV that will be floating around, you don't have to worry about speaker wire going all over the place too much. But if you do, be sure to check out Flatwire or Wiremold Raceways. They'll definitely help you create that cohesive look that will have all your technophile friends complementing on your serious mad skillz.