Same here Graham. Though it worked well here, please don't rush a build to make a GB deadline. We do usually extend the deadline when needed, though generally not more than 2 or 3 weeks. I try to post a warning 1 to 2 weeks before the end to allow everyone to either finish up, say "screw it", or ask for an extension. The prize money sucks and is not worth ruining a nice build.
Many GB's aren't long enough for my style either and I've left several builds half done, especially the summer ones.