So.. turns out, I could make it fit.
To do this, I added spacers to mount one side and then use the offset brackers plus spacers to mount the other side. The rad is as far forwards as possible, and it *just* has enough space for one 140mm fan on it. Because of the full ATX board I have in there, there's no way I can get the second 140mm fan on it. I'm going use a 3D printed plate to mount the 120mm fan offset on the 140mm mount.
I've not fully stressed it yet, and it might make sense to horizontally mounted the 4080 - but I'll see how it goes.
To do this, I added spacers to mount one side and then use the offset brackers plus spacers to mount the other side. The rad is as far forwards as possible, and it *just* has enough space for one 140mm fan on it. Because of the full ATX board I have in there, there's no way I can get the second 140mm fan on it. I'm going use a 3D printed plate to mount the 120mm fan offset on the 140mm mount.
I've not fully stressed it yet, and it might make sense to horizontally mounted the 4080 - but I'll see how it goes.