Put computer stuff on rack?

I want to gain control of all this electonic junk spread around in this corner, arrainge the wiring in a saner fashion... AND have everything on a castored movable rack. My monitor is on an "elbow" swing mount above the desk for free desk space, it's great...

Where does one learn about sensible layout, assembling "racks" and get the components (I really hate to have to go buy Wally's gray steel shelving for this one!:laugh:)

Components:
PC tower (fairly big HP "media center")
Cable modem
Wireless router
Sound system (rarely used) speakers + sub-woofer
Rather large external backup drive
UPC
All in one printer
Maybe some extra storage for paper, etc.

I'm open to any suggestions except "laptop".:laugh:

Thanks!:good2: