Hey, I was surfing around and came upon your build thread since we are building the same machine.
I noticed that your top cover is not vented which would mean that you are pulling in air through one rad and recirculating the same air out through the next rad.
Am I correct? If I am, and if you are in fact circulating the same air through both rads I have to tell you that this is generally considered bad practice.
Essentially, the second rad is useless because it is using the warmed air of the first rad.
There are a few tests that were done to demonstrate this, one by Martin if I recall.
I'm surprised nobody else told you this. You might consider getting a vented top and having both rads pulling from the sides and exhausting inside and to the top. You will get more mileage out of your rads at slower fan speeds.
hold up before you bash someones build... it will decrease performance, (why you run the water through the warm rad before the colder one) but it is by no means useless... that said, i think you would benefit from having a vented top pannel, but to all their own