I removed the internal front bracket and mounted the fans directly to the front, there is exactly enough room two 120mm fans.
as for moving the the HDD columns, i only had to move the front one to make room for the fans in the middle.
I could have moved both of them closer to the front, which would have given me more room for the power supplies, but it fit as is so i left it.
as for running 2 power supplies. initialy I had only 1 PS and the air comming out of the back was very warm. adding a second one made it run cooler.
as well as afterwards overall power usage dropped by 20W with the same components.(measured from my UPS).
I run the motherboard(Q6600 OC 3.6Ghz) off of one, and Hardrives(15 of them), watercooling (2 MCP600pumps & 2 120mm fans) & case fans off of the other.
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