Adapters/extenders are made and used but I would not use them on the high draw cables runs. For 4 pin Molex and 3 pin fan extensions yes, for me, anything else, NO. I cut, solder splice in more 18AWG wire then apply heatshrink to any high amperage wire.
You'll find a wide selection of adapters and extenders at
www.pchcables.com.
If you search the Cases & Cooling forum for P-180 PSU, much will come up. If I had a P-180 I'd offer more. You will find advice on how to make the cable runs and you might not need extensions.
In the Motherboards Forum, read"Heads Up on PSU Adapters!" Case closed,afaic.
...Galvanized