Case complete, installation and testing of computer components:
First up, the radiator mount. I made the case size based on the radiator size, so no real mount needed. There is barely a quarter inch on any dimension, and the front panel wires and fan power on one side push it to the limits on the other. So, just a couple notches in the frame and bend them over a bid to work as a holding mechanism. The PCIE riser support will hold the rest of the radiator in place.
The bottom has both sides tabbed, but the top only has the front side tabbed. The radiator is placed in location, then held in on the rear by the PCIE support bracket. This bracket hold the PCIE riser and has a spot for a bolt on 2.5 drive on the bottom.
After making this bracket and installing the push/pull radiator (with 12mm thick fans on both sides + 3mm offset for fan scraping), it appears my PCIE riser will not be able to plug in the USB on the rear (left of picture). I have other risers, ones that I have modified for other cube projects, so I used one of those and it fits fine.
I then added all the soft tubing, filled it up, and powered it on! It is tight, I don't think it would have fit in the original cube, even with the radiator external.
Some final burn-in and testing before I close up the case and call it complete!