Thanks for all the info.
I checked out some possebilities, and I'll ended up modding my own midi tower, to be able to handle 3 5 1/2 bays inside
For all the Water cooling stuff, I'm building a seperate case, that will go under my computer case.
For this I have 2x 12 cm and 3 x 8cm fans for intake.
The 3 rads will gave one 12cm fan also.
Pumps go in the box also. From the bos to a hole in the botom of my case, and it's connected with 20mm hose.
I'm putting some foam inside, to dempen the noise. (if any, the fans will run at 7v)
I'll post some pics when it's completed.