Yeah, me neither. I've been working on my own hack on the side for about, oh, 4 and a half months now, and I've gotten little to nothing done. :P
They usually pass around an ips. Person C probably doesn't need a an ips until he/she gets sprites done and they're ready to be inserted. Likewise, all Person A needs is simply a copy of the ips. He/she can map on his/her own, and save the maps to the computer using the File > Map > Save Map As.. and Insert functions. The scripter is probably going to use the ips the most, as he/she has to do quite a bit of it in-game.
But yeah, your hack, if it keeps showing well, will probably be a huge inspiration to hackers like ShinyGold. It's been around for, what, a few weeks? And it already has over four times the amount of posts mine has ever had. :D