Luggs / RJW / Harry, thanks guys. Yeah am a bit chuffed... was bricking it a bit so quite pleased it all turned out well.
Concept behind the QDCs was to allow me to separate out all the main components from the loop without having to do a full drain. So using the 6 sets, I can take out any one of the main components (each of the 3 rads, the CPU water block, 2xGPUs 'block') and then slot them back in (presumably requiring a little extra fluid and a re-bleed). Given that this is my first ever pc build I thought it prudent to do so.
Using the 2xD5 varios provided an increased flow rate which hopefully will offset the additional restriction of this number of QDCs, as apparently also does the use of 1/2inch ID tubing. Will post pics of the fluid added soon.
First temps at idle as follows, as reported by AIDA64 Extreme, at 4.4ghz on the cpu, gpus at 'stock' overclock:
CPU Package: 25-26C
GPU 1: 23
GPU 2: 25
Water temp: 24-25 average across the 3 water sensors in the loop (1x bitspower in-line, 1x aquaero inline, 1xXSPC inline)
Fans at minimum speeds
Pumps are set to 2 (of 5).
A little concerned with the 2 degree differential between GPUs. They're set up in parallel so had thought the temps would be identical from what I'd read on the net.
Will over the next few days begin to set up profiles and curves and then start to tune the fan speeds to loading scenarios with stress tests, game tests, etc.