Looking good, in the end I too had to use a dremel because I needed around 2-2.5mm clearance and well... my hands would fall off if I did it that way. but now it fits, looks good and probably works. Just need my case to arrive (by end of this or next week) and rads (7th february.... should have ordered them sooner).
Looking good tho so far.
Also, I too am scared of cracking the acrylic but I have a dry tester so I will start gentle and if its not enough, screw it in a bit more and try again. I got enough time to test that.
I also plan to get acetal version of optimus WB for KP if possible when it comes out.
And looking forward how the temps end up compared to the full block from evga and the diy one you made.