Ahh, okay... thanks! I just wanted to make sure I wasn't taking off more than what was necessary. I had seen their first video, and I saw that they took the entire thing apart, which I figured wasn't necessary. I'm guessing that you didn't have to remove the backplate?
Oh, and I did a bit of gaming with the card in its normal state, and goodness... I'm not sure how people stand these blower-style coolers. They're so noisy.
Definitely is doable, in fact, all you have to remove are approximately 8-10-screws.
The grey portion with the word GTX 1080 Ti and the clear window is held on by 4 screws. Two black ones on the side of the card, and two hex screws by the Blower (they are the smaller ones). You can know slide off that whole grey cover. You can also fasten the screws back on to the cover for storage purposes (as you won't be needing it anymore).
Once the grey cover is off, you can now remove the black shroud that covers the fan by removing 6 screws. The remaining 2 hex screws, and 4-smaller black screws (you can follow the the shroud to see where they connect, two are right next to the fan and the other two along the border towards the heat sink.) Unplug the the GEFORCE LED and this whole part comes off.
You can remove the heat sink by removing the four tension screws on the back, no need to remove the Back Plate.
Now the tricky part, if you got good hands it shouldn't be too hard. You can see the fan power in a small open next to the fan. Just unplug it, plug your pump+pass thru and connect it back to the power plug. This would definitely be easier if you can remove the grey shroud portion but that is held on by screws that you can only access by removing the whole cooling plate, which requires a bunch of step and of course I said screw that.
Once the plug is in, tuck the cable a little, connect the black portion with the GEFORGE LED logo (power too), and slide it under your hoses (snug fit). Screw the 4 little screws and two hex screws. Line up your pump plate, and screw in the four tension screws. Done.
Took me about 30-35 minutes, half asleep without morning coffee. Tweezers will be a big help, I got large hands so I couldn't get my fingers into the small opening. And at first I wanted to remove the grey portion of the shroud but watching their tear down video I saw how its held on, and the amount of work wasn't worth it.
And yeah, the ref blower is only good up to 40-45% load, after that, its unbearable.