Finished install over weekend using the stock shroud, ended up leaving the top window plate off as it was giving me some clearance issues with the pump power cable trying to route it far enough back for the pumps to point towards rear instead of side (so installed same way as shown in the Youtube video).
Note of caution for people that are going to attempt this: if you don't have very dexterous fingers/fine tools, don't try to be lazy and do the fan/led cable through the little gap in the shroud. I tried using a pair of tweezers to pull out the fan power cable to route in the pump and ended up actually stripping one of the cables. Gave me a good old panic attack as I couldn't tell if I had actually cut the cable, until I disassembled the entire back-plate and removed the shroud completely to access the cables. Luckily it was just the insulation that was stripped, and a dab of liquid rubber later I was back in business.
Figuring out wiring was much simpler after I'd disassembled everything, and it was another half hour of putting back in the 20+ screws before everything was assembled.
Some initial tweaking and stress testing has it stable for at least half an hour or Firestrike stress testing at:
I'll probably drop it down to 150 core and 500 mem for now to keep it nice and cool and stable.