Awesome. I initially was going to put 45mm fan holes on the opposite side where you put yours but the power extender got in the way. With the second version, I'm going to try and find a way to support some case fans but since I'm going to use a different PCIe extender that won't require the cable be bent (as you suggested), the space where your fan is installed now might shrink dramatically. I guess we'll find out once I get the first prototype back from the machine shop either this week or the next. I've had what I think are good ideas on how to improve the design so I'm looking forward to getting valuable feedback such as yours!
Edit: Prototype 1 will be punched tomorrow. Then they have to bend it which could easily take another day, but then they are going to paint it and ship it to me. I expect to have it Friday or Monday as of now.
Any news on the new bad boy? I am loving mine!