Well from what I understand (based on what you just said), there are 8 fans possible. 4 in the front, 2 in the back, and 1 on both the left and right side. If this is the situation, then put the 4 front ones blowing in, and the other 4 blowing out. If temps are an issue, simply shut or reverse a front fan and check the temps out then
. Not sure if your specs are listed... but if they aren't can you post em? I bet you can just save yourself the headache all together, you may not even need that many fans.