Hey OV,
Glad you like it! For the fans... note that there are 7 positions to mount them... 1 in the back, 2 on the rad bracket and 4 on the cover... so the number you can add (or need) depends on other hardware installed. (No fans on the front... they were never needed.) For instance, I don't think you can fit two 120x25mm fans on the right side cover with another two on the rad bracket along with two HDD's and a large tower CPU heatsink all installed on the right side. (Maybe you can with 120x15mm fans but I'm not sure.) Anyway, with the CPU, GPU and PSU fans going, you rarely need more more than than rear fan unless you're doing serious OC'ing or liquid cooling.