Some of you may be wondering, "where did you get those sweet plans for the server rack?". Well I have to give credit to Jeremiah Duke for mentioning the Google SketchUp program in his video about making his own server rack.
The Google SketchUp program has a free as well as professional version and is a full featured CAD program that is fairly intuitive. I just looked up the actual dimensions of lumber that I was going to use, then I drew lines to the size making 3D boxes which the program then interpreted as solid objects. Finally after making multiple revisions I came up with a model that is made exclusively out of 2x4 lumber with the exception of some 3/4 inch plywood and caster wheels.
See this video for an idea on how easy it actually is to make 3D CAD models for your next project.