Those numbers seem about right. My minicab is about halfway built, and IIRC it's about 30" deep. It is also 18" wide and I believe 25" or so high. I'm also using a 17" monitor.
My CP is rather large at almsot 12" deep, so it's possible to save a few inches. I am debating on what controls I should really use on the CP now, so I may actually wind up hacking off part of the CP.
Hopefully I'll get pics up this weekend. School started this weeks

so who knows when I'll actually have time to finish it though. There's always so much to do when I come home for the weekend, heh.
EDIT: Clanggedin makes a good point: My 18" would be really tight for a 2p CP. Mine will be a 1p with a spinner, and possibly a trackball (hence my large CP depth).