Even if we are lucky enough to be allowed into the plant for a tour, I can guarantee you that you won't be allowed to take pictures. This is how it is at the Corvette plant in Bowling Green...they are very strict (I guess for espionage reasons).
By the way, as a die hard Vette nut, the Corvette plant tour is one of the neatest things I have done. I even got to "give birth" to a Vette by being the first one ever to crank it up on the assembly line. They give you a certificate and everything If they offer this for the Solstice I would highly recommend a trip to the plant. I wish I could have gotten to see my own Vette being built, but I didn't actually make it up there until years later.