I'm contributing my weapons work to them too, as they contacted me and the rest of the HPMod team and asked if we would like to join... I've gotta say that there's a really big mod they're doing, but I think they can handle. Actually tried to convince them to base the maps on OJP CoOp in the beginning. I could get in touch with Selman (the team leader) and see what he says about it.
Their demo was kinda buggy in the hangar...in fact I think they could've compacted the level a bit better instead of having so much open room that isn't used. I don't think they did any gameplay changes - everything is still base JA with ornaments on top.
I think there's a mod with the lightsaber system for SP in JKA. It's name was Serenity. I've never tried it, but there are videos showing him manually blocking and attacking with a lightsaber (little bit like MBII)