I will see but it is dead easy.
Two sides, top and bottom pieces. Fix together with plastic furniture blocks with a gap of standard rack with taking account the size of the runners which can be sourced at multiple cheap places http://www.ebay.co.uk/itm/19-INCH-RACK-RAIL-STRIPS-P...
Cut a suitable hole in top, bottom or side for cable entry, fix 90 degree corner blocks to fix to wall and job's done.
Much easier than I expected. About a day to make and fix the rack and then a long time to run cables fix boxes for multiple connections etc but not it is finished it's is "easy".
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