Also, I would mark right where that big wad of cables comes out of the PSU and promptly punch a 1" hole right to get all those cables out the back. Not sure how much of the tjharlow 1200 build you watched, but the guy really has it figured out how to build one of these things. Even has me thinking I need to watercool a system in one.

Also... I would move the drive cage with the fan housing up. I'm using mine as a wind tunnel to the video card on my 900. Gives you more room for the cables, and there really isn't a huge demand for air on the power supply.