Stumbled upon this old article as we do. Sometimes I skim over these brilliant articles for years with out realizing the gold that they provide. Anyway it's a brilliant concept. I know there has been talk about running a 24 hour game at one of the Oldhammer days in the future, which would be awesome in itself.
A weekend day long multitable battle or campaign though for me would be awesome! Everyone bringing their army, with each battle fought dictating in some small way the final outcome of everyone else's battle. Could be the stuff of legends!