I like the Runabout/Runamok idea. I have an extra complete Sideswipe and another Sideswipe head aside from that. With a little modification and some putty, the heads could be reasonably accurate.
Anyway, I picked up a Sunstreaker today along with a couple of Scions and a Ricochet/Rollbar, all at $11. I pretty well know what I'm going to do with all of them, but now I just need to find the time!