Aurora R5 - Upgrading & Enhancing The Water Cooling?

Ok, so I'm looking for help from those who have an Aurora R5 already. I've seen some awesome advice from Cass-Olé & Tesla1856 & I'm hoping I'm not the only one looking to do this?

From the docs, it looks like the entire top part of the machine is empty, and I'm looking to put it to better use.

From every review ever, the Nvidia Titan XP doesn't have as good of a cooler as it really needs, so I'm looking to turn this into a hybrid.

Unfortunately, kits like EVGA's Hybrid setup won't work, because there's just not enough room to add an entire 2nd radiator anywhere. From my diagram measurements, it's about 1/2" too thick to replace the front fan and still fit in a full sized card, and there's just no other 120MM fan anywhere else to replace, so no joy with the simple approach.

Also, from the schematics, the front of the "top hat" on the R5 is solid (likely the optical drive) so even if the front of the top was tall enough, there's no air flow to cool the radiator anyway. Strike 2.

This leaves a Quick Connect, expandable AiO solution as the only real alternative I think. The makers of the OE water cooler (Asetek) seem to have such a system as the 550QC & 740QC option, but I can't find it in stock, or a review on it.

Also sadly, Asetek doesn't seem to share dimensions of their cooler either, so I can't even confirm it's the same size/width/height either...

First then, Does anyone have an opinions/experience on this 550QC/740QC option?

As a 2nd possible solution EK, makes a similar product called the EK-XLC Predator 140. This also seems decent, but its listed dimensions: 195 x 142 x 68mm (L x W x H) I THINK is too wide for the R5.

Can anyone measure out the width of that top channel and confirm? From what I gather, width is around 120mm-125mm?
Is it at all possible to widen the top plastic without too much trouble?

Now, to throw one more wrinkle into the mix, as I'm an American, and all things bigger are better.... I'd love to throw in an EK-XLC Predator 240 (double width rad) Dimensions: 295 x 133 x 68mm (L x W x H)

BUT, once again, I'm assuming that insanely huge top hat is not large enough because of stupid sloping angles and such... Plus again back to the DVD drive below not allowing decent airflow through the bottom. Sound about right?

Anyway, Thanks in advance for reading the wall of text and offering any advice you might have.

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TL;DR I'm looking to add an expandable water cooling solution to then upgrade a graphics card to hybrid water cooling also.