On the High-Tech Build Days, we create the tech that will soon get our kids moving. We put together wiring harnesses. We build custom drive systems that make it possible for kids to drive using only their hands, or their feet, or just with a flick of the finger or the press of a cheek. We modify steering assemblies and ready safety systems for installation. We write and test software that allows some of the cars to be driven by remote control and other specialty functions.