555 Timer AND NOT Sumo Bot?

I know it can be done, but I wanted to find a schematic of one. It is a AND NOT and 2 555 Timer operated Sumo Bot. I was wondering how I should Approach this, as I know that Infamousbob said that He had one, or he thought he had one. I really want to dig deeper into this, but Google hasn't been much help.

Thanks

I'll draw it up again. It's really quite simple; has floor monitoring for the lines, IRPD for tracking robots, and 2 555 one shots for turn around timing routines. Not the best way but it works well enough.

Ooh Cant wait

Thanks!