Sounds like a great idea.
There are quite a few costuming groups here in the UK that have BSG elements to them.
The UKG (part of the 501st), The Star Warriors, UK Frakkers etc, etc.
Mostly New Series but quite a few costumes from the Original, mostly Cylons!
They may be interested in a central costuming group for old school BSG, but obviously I cannot speak for them.
There are several of us from the Aliens Legacy board that are working on Colonial Warrior Costumes, one is even having a go at an Ovion!!
Good luck and keep us posted on the Black Squadrons progress.
Andy