That's not too bad. You should have seen the one a group of my freinds wrote, when they were all living together. Someone would write a few pages, or maybe a short chapter, and pass it round. The end result is quite impressive. It came out at the end of a long evening, and guessing whos's is is who's was a great game.
Mix and match Mills and Boone isn't a bad idea either, in the right circumstances, such as after beer.