Well if the fans have 3pin connectors as well you are in luck
A fan controller will potentially solve any fan noise issues you may have without needing to buy more fans.
If I may suggest you plug some into the motherboard headers (assuming you are not doing so already) and check in the BIOS (or use a program like speedfan, Everest or
Hardware Monitor) to check how fast the fans are actually spinning, because if they are spinning at 1200rpm and too noisy then new fans might be in order but if they are noisy but spinning at 2000rpm it could be easily solved with a fan controller (or even using the motherboard fan headers if they are controllable, and you have enough.
As to PSU routing the problem seems to be that you have to travel the width of the case as the PSU is upside down (not that you installed it wrong, just that they normally are the other way up) does it rest on the bottom of the case or could you potentially turn it over without totally eliminating airflow to the fan? For the 4pin connector you might try and run it to the back of the case and then up over the back fan rather than round the graphics card. Or you could always buy some extension cables
http://www.scan.co.uk/Product.aspx?WebProductId=656145 or
http://www.scan.co.uk/Product.aspx?WebProductId=557926 and
http://www.scan.co.uk/Product.aspx?WebProductId=557927
Finally I think Pob was asking how the fan connects to the window rather than how the panel connects to the case. I would guess screws or possibly split pins.