I recently built this rack:
https://skydrive.live.com/?wa=wsigni...1322D5B!1119
Strange as it sounds, but I had designed this when 11 years old and although at the time I built it using a solid 6" x 6" rear upright with two front facing threaded bars, I have taken some inspiration from Tony Gee, the designer of the flexy table.
I must say it is the businss and although the photos do nto show the actual finish, which I only completed yesterday (varnish that is), it stands the wife test (she loves it - so much so, she let me build an indetical A/V rack - again varnished).
I appreciate this design, mostly due to simplicity, ease of change as and when required and moreso, dependant on what thickness of wood and size of nuts you choose, you could get it all done for less than £150, might sound a lot, but you wont need to change it for a very long time.
My future plan, is to incoporate the actual plug socket on to the rear facing part of the shelf, i.e. shelf will be slightly thicker than the height of a shelf, cable will be run internally to the edge of the shelf (do note shelves will be 3 sheet of 18mm ply clamped together). This will allow me to give a dedicated earth to each socket, without any running in parallel and keep cables tidier. Wont do so with the actual interconnects as it be OTT and we always change and swap these things.
Lots more can be done with money, but for my two units I invested £450 in total.
Do note that I used 50mm thick MDF and M24 nuts, washers (metal & rubber), threaded rod.
If you want the chunky look, you must go M20 and above. Anything smaller, and I tried this, looks pathetic.
If you need infor on cheap suppliers, do let me know. I researched prices for nearly two years as I was getting absurd quotes.