Ah thanks, I didn't realise the rad could fit in the rear where the PSUs are, thought they only connected at the front side of that part? So as it stands then, I can use a 240mm top, 240mm bottom & 360mm upright but inside the main chassisThe 50mm restriction is if you mount the rad at the rear side like I have done here:
If you used 240mm in top and bottom then you should be able to use a thicker rad but on the front side of the vertical mount - not the rear side. You should have room them.
You 100% cannot use 360mm and anything thicker than a 50mm in the vertical mount - because if using 360mm in top or bottom it would block any 360mm in the front side on the vertical mount.