You'll run into clearance problems against the PSU with the radiator pointed that way. The PA 120.3 is almost as wide as a PSU, so you'll only have about 3-4 cm space between the fittings and the PSU, in which you need to fit the barb AND turn the tubing. Also, if at all possible, you want the CPU block to be the first stop after the radiator, and the reservoir to lead right into the pump.
Here's a nice picture to look at.
Or something like this, maybe. Sorry for the mess, I did it freehand. The pump is behind the rad, and there's room for the PSU's cables to come out.