Inspired by the same brainwaves as the Build-A-Bear Workshop, RIDEMAKERZ allows visitors construct a customized toy car from the axles up with dozens of options that add up to nearly 650 million unique combinations. Guests begin by choosing a body from a stock of Vipers, Corvettes, Mustangs, trucks, and hot rods that can then be accessorized with free stock parts or specialty chassis, tires, rims, and oil slicks. The hot-lava Chevy Camaro ($32) sports a metaphor for the rubber it plans to burn with orange flames on its sides, and the jewel-blue RZ Rascal body pairs its smooth curves with working headlights and taillights ($22). Sets of multicolored or racing slick tires maintain traction while pushed across carpets, hardwood floors, or up the sides of living-room furniture ($4 for two). Glistening hubcaps ($3?$4 for two), undercarriage-glow lighting ($10), and other car accessories offer further customization, while sound-effect chips ($3) relieve vocal cords strained by persistent engine imitations. Builders can also upgrade to a radio-controlled street chassis ($25) to assert hands-free control over the vehicle's movements.