The hole spacing works out for the dual 60mm rad form alophacool but the end thanks would not fit. The next revision I am working on would fit this radiator
I have seen it before and wanted to incorporate support for it.
The 240 rad + fans combo can be as thick as an sfx power supply. About 65mm should be doable (40mm rad + 25mm fan) but I don't have a radiator that think to test. Also although it would "fit" you would be pretty much touching the GPU backplate.
Fitting a 280mm radiator would be hard. Making the case taller to take a dtx board and a taller rad is easy but, I can only think of 1 board like that. It would however be impossible to keep the same width. A 280mm rad is also 20mm wider and there is no room to mount that internally. You would have to increase the height AND width by 20mm.
I will check the current CPU cooler clearance after work, but also for the next revision I will make it however wider it needs to be to accommodate 110mm. Would definitely help with thicker gpus too.
I don't have any renders yet, coming soon, but I pretty much took the same exact frame and gave it side panels for a slightly more refined look (although with visible exterior screws) and metal top and bottom braces for strength (rivets hidden). Already adjusted it all to be steel instead of aluminum (after my experience of bending and deforming these prototypes it seemed like the way to go). Moved the front vents to the bottom instead to have a clean front panel. Bottom wood removed. Top wood made into a decorative element only.