And here's his mechanically restored 1971 Cadillac Eldorado convertible, pimped out years ago by car-famous Les Dunham for the Blaxploitation "Super Fly" movie. "These days, somebody buys an Escalade and puts 24-inch rims on it and goes, 'Wow, that's pimp,', he says. "I'm gonna rebuild this car, and show them the definition of the word 'pimp.' ... My intention is to turn it into my daily drive." But the car that ZZ Top's Billy Gibbons came in and stared at for an hour and a half is this radical 1941 Ford: chopped seven inches, channeled six inches over the frame, sectioned out of the body another four inches, with a genuine Carson removable top from the 1960s; paint-shot in satin black with flames hand-done in white ice pearl. It was first customized by George Barris, who designed the Batmobile. "What would somebody pay for it?" Koker says when I ask for a price. "It's got history. You can't look it up in a book and say, 'What's it worth?' It's probably around a six-digit machine. ... But it's not for sale."