Wow! love the disappearing doors! Looking at the window and door retracting speed, I'm guessing a combinaison of air cylinder mechanisms are used. I can see this idea catching on in the near future, specially with minivans since they benifit from a higher ground clearance.

The Hi-wire is also a really neat prototype for sure. Being a prototype, I supose you can overlook the door rattle and the noisy vehicle control rack servo motor!