Don,
Glad you enjoyed it. My daughter and I just got back from Chicago yesterday via Metra. We were at MSI on Wednesday. I liked the ships, too. My 15-year-old was getting bored, though, because she said I was spending too much time reading every detail about the ships. Guilty as charged!
The Pioneer Zephyr has been updated since I was there last -- hope you had a chance to walk through it. It has a nice walk through visual/recorded presentation as part of the exhibit now.
TM Books and video has a nice video out on the model railroad and how it was constructed. I've had it for a while and it's worth it as a souvenir of your experience.
Mike