Idea: Zombie Sim Game

I guess this is a good a place as anywhere to jot this idea down:

This summer, B. and I were chatting that it'd be fun to roll ourselves up as ordinary level characters in a high-simulation system like GURPS and then run an end-of-the-world zombie game/simulation. It would be cool to set this up in a specific city location, so the DM could have a real map of the area, thereby determining how long it'd take to get places, where certain supplies would likely be, zombie concentrations, etc. It'd be fun to see how long we'd last with all our now-useless skills, like computer programming and psychoanalysis. :)