Heres a link to a few different designs from various gigs I've done.
http://gallery.mac.com/simonpugsley#100001

My catalyst is based on the XL 20u single rack - the UPS will move when I add image-pros - LCDs will move to an external box (not in the drawer)

I used to take care and build the XL Catalyst dual and single racks - the majority used to remain permanently cabled with 2 scan converters and a decent rear panel. Changes were made on a job per job basis.

Neg Earth Racks are well designed but don't include scan converters and are difficult to fault find.

Lite Alternative racks are compact and use all available space - not a lot of rack space though.

The old HES racks are fine for 'basic' setup, if you're happy with the mac on its side.

An 18-22u suspended rack seems to be the best starting point.....

Enjoy

Simon