I figure get a 6 string gecko bass and put the humbucker RIGHT next to the bridge, and that could be a pretty close sound if you have a technique similar to Les's. if he can manage, that'd be cool to see!
also Joseph, I normally hate slapping, but Les, Larry Graham, and Stanley Clarke are the exceptions. they are the only ones who can do it without it turning into a mish mash of awful tone, rhythms, and octaves. but they also know how and when to use their fingers, too.
and if anyone hasn't gotten it yet, the "cover" was a joke. he doesn't actually suck that hard. great song, though. Primus/Les Claypool is amazing.