Dick,
Happy when a plan comes together. My experience with this fix to date is that the slide is not settling further and that the fix has held up quite well. If the slide did continue to settle, you would then be able to add shims as needed. I encourage all of us Beaver owners to document fixes to our coaches for problems we face as they get older. They are great rides and we would be hard pressed to find better coaches in the current market. "Long Live The Beaver" :-)
Later Ed