This is one goofy contraption. why the obsession with PCI connectors? Is that really the best solution for industrial scale mining?
I prefer it greatly over a proprietary power supply. High end efficient used +12V server power supplies will beat new every time, not only in price but performance as well.
Buy yourself an automatic wire cutter/stripper machine, some 5000ft spools of 16awg primary wire, reels of crimping pins and bags of end connectors. And you will never have to buy a PCI-E cable again, and you can make them just the length you need.
thats all good for smaller scale home hobby miners.. but you gotta think giant farms would prefer all in one units similar to the s4+, SP10 and SP3x.. just makes the server rooms cleaner and easier to swap things in and out.. but then again ive seen some china farms that simply dont give a crap about cable management and are just giant rats nest of wires everywhere.