Building Rackmount Cabinet for Home Use?

Timothy M. Schumann asks: "I am trying to build a small rack mount cabinet for my family to help with the clutter of our home network. I don't want to purchase a rack or cabinet pre-manufactured; I would like to build my own. However, I have been unable to find a list of physical specifications that racks and cabinets must conform to when built, so I was wondering if any Slashdot readers could help me find such information? Just for a frame of reference, I'm looking for something along the same detail level as the BTX form factor specs that can be found here. Any input on cost effective hardware choices for rack mountable UPSs, switches and/or cases is also welcome." This topic was originally discussed some two years ago, and while there was some useful information was presented, the basic question wasn't really answered. If you were going to try and build a custom rackmount enclosure for yourself (or someone else), how would you go about doing it?