Excellent thread man. I'm planning to watercool an X1000 myself and had arrived at a similar design - including the XSPC bayres! I hadn't thought of drilling holes for the rear 140.1 hose fittings, though - genius!
A few of questions:
1) that radiator mesh cover that you're planning; why not just use the fan cover that came with the case?
2) I see that you don't have any spacers between the rads and the fans. I have heard that putting these in improves air flow, by avoiding a dead spot between the rad and the fan hub. It looks like there might be room to squeeze these in. Any reason for not doing so?