Hay Shazza your Sketchup work is looking good, love the red fans and it's good to see you got the hang of doing the tubing as well, very nice.

As for mounting the rads, Bitspower have these http://www.jab-tech.com/Bitspower-Ra...K-pr-4404.html.
There is another design I plan on using, I could get them from Gam mods but I plan to make them myself.
His site is down for maintenance at the moment so I will post a link when it's back up and running again.

I just remembered this
This photo is from NaMcOs last build "The Project". The ones at Gams are made of aluminium not acrylic like NaMcO's are, but you get the idea.
I am sure someone in the states sells them or you could make them your self.

As for mounting the pumps, you could use a piece of aluminium bent up into a U shape to fit in between the rad brackets.
Bolt it onto the rads by using the fan hole mounts at top of the brackets so it sits flush with the top.
Or you could also just use two pieces of aluminium angle (25x25mm/ 1"x1") thats are long enough to suport the pumps and bolted the angle to the rads using the fan hole mounts.
Then cut a small piece off that aluminium sheet you have to cover the gap between the aluminium angles.
Then bolt that samll pieces of sheet aluminium to the angles so you can mount the pumps on top.

Hope that all makes sence to you Shazza.