120mm fan+ 2X 25mm fan = 2x dead 25mm fans. I just killed a 40mm fan by putting it in the enclosure with a 80mm fan. I don't think the PSU will be getting enough exaust. It would be better to add more holes or a false bottom. There's what? ~7watts going through that rhebus? It's going to generate a LOT of heat to slow down that monster.