Just to comment on the 2nd video. (Very well done BTW) when you did the TIM on the ram it seems a little excessive. Have you tried removing the water block to see how much of a mess it is? I think the way you cleaned the ram was fine. I've done it the same way hundreds of times and if a tiny bit of cotton comes off its easy to remove it. I think there's a bit to much paste on the south bridge which brings me back to using the white stuff. (Industry standard for electricians)
The board looks awesome I'm looking forward to your next installment.