Actcgmc,
The plan is good, but kind of like dealing with old cars, they are never really done. (Says the guy that has a friend's '55 Chevy on his lift and parts won't be in for maybe a week.) Those things happen. We found a lower control arm was damaged more than we liked.
There are owners all over the country, and depending on which Lancaster county you are in, there is a good chance that you can find one to help you.
Ready to travel coaches can be found, but be ready. We have an expression that has proved very solid and true...
"A reliable and ready to travel GMC will cost you 30k$us, that is all at once or as a kit."
(Those that think it is less than this, are older and have not recently bought many parts.)
What this does not say is that sweat gets billed in a full shop rate. (That 100+$/hr can buy a lot of tools you won't regret having.)
If you have to do anything to keep it reliable, look to the dedicated suppliers to provide what you need. They know the stories.
Matt