I am impressed with what you are doing with this. I worked for a company that bought one of these when they came out and as Chief Engineer I got to use it frequently. Made several trips with the family throughout the Midwest particularly upper and lower Michigan. It was a real attention grabber.
About 7-8 years ago I found one of these models and bought it. It was in fairly good shape, needed cleaning up but no broken/missing parts. I also want to detail the interior but have not been able to separate the upper body shell from the lower. Tried freezing the whole thing hoping the joint would "pop", tried many ways of prying them apart without damaging anything, but no luck.
Would you share how you were able to get the upper and lower body shells apart without damaging them?
Thanks, Carl Gowan