I figure if I dedicate most of Saturday and Sunday to a feverish lock-in game developing crunch fest there's a 30 to 50 percent chance I could put together a fine game by the official contest end. However if I do that, I'll be completely burnt out on Monday when I need to be an alert game judge. At a more sensible relaxed pace I don't think I can get more than a hamfisted (or should that be beeffisted?) mock-up done by Monday morning.
All in all I don't think it's worth flogging a dead cow, so I might as well concentrate on my role as contest administrator and judge from now on, and switch to redesigning the engine. I guess with prototyping game ideas you'll always have to deal with more than a few duds.