Now I've managed to get all the parts home that I need. The metalsheet of 1000mm x 500mm x 5mm aluminum came home this summer, since then I've been working it making all the nececcary cutouts as well having it bent. (I had to find someone with really heavy machinery to bend this thick aluminum) I've also "test-brushed" it to become brushed which worked out nicely.
After that I've been grinding down uneven edges as I used handtools to cut out the holes and handtools to make the screwholes and threading.
To fasten the PSU I've decided to go with leatherstraps to make it all pop a bit more with a different fabric amongst all metal surfaces.
The plate itself will be brushed aluminum, pipes will be chromed copper, fittings will be either white or gunmetal. I've not yet decided if I'm going with Corsairs Hydro X now that they've released white parts or if I'll go with a mix of EK and Byski.
The biggest problem I've been working with all fall save for grinding down edges has been managing to fit the plate to the monitorstand and manage to get the monitors VESA-mount to fit on the plate afterwars. I have found a solution that I'm quite happy with, right now it looks a bit "gettho" but the finish will become better.
I might also be giving up my plan to cover it all with a sheet of hardened glass or akrylic and go with an entirely open build.
In the meanwhile I've also repainted my monitor to go with the white theme. This far I've only made the bezel and backside white, but after seing the finished result I'm planing on changing color on the monitorstand and the bottom bezel as well. (I'd appriciate thoughts on that though)