OK - another thought.
Remove the front fan to create some space, shift the rad over to the left so that the fan shroud is OK.
Then i could do some cutting above it: (a) to let the air go up and be drawn out the back 120mm fan and (b) to have the pump outlet tube come down somehow.
Pump somewhere up here (would make routing the tubing from the gfx easy too):
Using bits and bobs that i have just taken out of the case you could even create something like this as a frame to hold the pump above the rad. and cut a nice big hole there for the air.
BTW am I right in thinking that my loop should look something like this:
Pump > RAD > CPU block > GPU block > Pump.
Is there a best place to have the T-piece and fill port?
Thanks.