I believe you've seen the molex to barrel adapter that takes 5 minutes to make. It's a lot safer power if you have the PSU for it. Yellow 12V line to the inside shielded wire, and the two center grounds on the molex to the outside braided ground.  I wired up 4 of these just to get my miners up while waiting on cablez. Not that he took long, 2 days maybe on his end and an amazing looking product!! 

So in the end you're going to hit 8 chips right? Have we thought about cooling the FTDI chip with a simple sink? If you need any help with water cooling let me know, I love the stuff. I didn't go that route because of ROI. Just be super careful if you drill into the water block not to permeate the chamber. Don't mix metals between sinks and radiators ETC. ionization will happen and slowly deteriorate everything. It's usually suggested to run the system for hours to leak test. The thermal conductivity of water exceeds air something like 10x so this makes me giddy.  Air vs water let my processor go from 4.0 Ghz to 5.2 Ghz in the end it is usually efficient enough that the next hindrance is hardware related as there should be plenty of overhead for heat.