Thanks to everybody above for taking the time.
The case I'm running at the moment is a sound-proofed & blow-holed Q500. Problem is it's on the floor & my kids are that age where they can't resist the reset button (I know I could disconnect it). So the plan is to use the YY on the desk, out of little fingers way, but without giving up too much case space.
Apart from that I love new cases - so the kids were a good excuse.
As for putting the rad by the front intake - those clever people at yeong yang have put a full length card bracket from top to bottom with just enough space to squeeze a fan in there. This bracket is arc welded and impossible to remove with cutting.
I feel it kinda defeats the object of watercooling to take all the heat from the CPU - dump it to the rad & then exhast it back into the PC (in my opinion, of course
). I know I'll not be getting the best cooling by pulling air from inside the case, but the plan is to have an intake blowing across the bottom of the rad which should keep things at about ambient.