Group builds are simply a group building within a set of rules. Could be ladies only, veterans, world war 2, prototypes, stalingrad etc. In this case, it is simply that it has to be 1/144 scale. The goal is 144 1/144 kits built in a 144 day period from January 1st to May 24th. Someone can join in at any time and the rules have been stretched to allow a kit that needed finished before the official start date to be included. 20 people have 33 kits "in" and there are about 5 or so that have been finished already. It's mostly aircraft with one tank and a couple sci-fi. I'm been promoting it for Konigwolf/Andrew (I'm webmaster for the 1/144 census {listing of available kits and accessories, plus links and usful bits}), but haven't officially joined. I may or may not actually be working on a P-47D at the moment and am simply holding out to tease Andrew.
Go over and visit and let him know if you're interested.
/forums/t/122144.aspx