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Whew! That's it for now Michael - use them at your own risk!
There are not as many as there used to be. As a youngster every year a friend and I would take a tour of GM's Framingham, Mass., assembly plant (long since decommissioned). I loved it. I can still visualize the place, I went so many times. One of my favorite parts was a water spray booth where the body of the car (this was in the days before unibody construction) was doused with water from all angles to check for leaks. It's first car wash. And the best of all was where the "rubber meets the road," the final stretch of the line where the body was lowered onto the chassis and they fired the engine up (usually on the first try) and drove it off - very cool. For a while my dad worked for Ford and I twice got a private tour the Michigan Truck Assembly plant in Wayne, home of the Expedition and Navigator. Much more sophisticated these days, but still the thrill of watching the body lowered onto the chassis and the whole thing coming together.
Anyway, sorry about the reminiscing. The bad news is that it does not appear there are public tours of Orion, home of the Bonneville, not even for groups (if we could even get one together). Carpoint's list seems too short; I wonder if there are other plants that offer tours.