[cellularmitosis]

I just tried "Brakes to go" today for the first time (basically your model, but only for brakes), and I am now totally sold on this idea. Granted, Brakes to go has a much simpler problem to solve (much easier for them to just show up with every possible part they could need to replace, then figure out what they need on-site), but I see no reason you couldn't expand their idea in similar ways (perhaps dedicated mechanics with rigs dedicated for specific jobs). Judging by the Yelp reviews for Brakes to go in Austin, I'm definitely not the only one enamores with this idea. Best of luck!