The PSU and pump don't really need any cooling. There are fans in the PSU itself to cool that and I imagine the pump will also get some cooling from it. The main reason for the seperation plate is to stop the airflow from being interupted by other parts in the case. I'll let you know how it goes when it's all done
Anyone know a way that I could give it a nice finish? The metal is scratchy and doesn't look like the finish on my case.