So, I posted the first half of this trip awhile ago (too long... back in January, I think).
I was given the opportunity to tour the GM Heritage Center, and it's something I will never forget. Ever.
Here are some photos. Check it out. 56k beware - there are a LOT of photos. I resized and did what I could, but this page will likely still take some time to load.
http://autowaffle.com/gm-heritage-center-part-two/