Here is one of the mods. Since the Rad will be mounted on the top panel replacing were the PSU went, there need to be a mod there. Right under the rad will be the HDs. Two hard drives for now. and then the Rad will screw into the top panel.
To start I need to cut the old PSU back plate. Then I drilled holes on the bottom in order to later rivet it to a flat sheet. The HD mounts will come out from the sheet metal and screw into the hard drives. When I was searching for a piece of metal is act as a mock up for the HD sheet I found that a CD-ROM bottom plate fit nicely. I am going to find an old CD-ROM with a flat sheet and use it.