I knew the day would come when my air conditioning unit would fail and after 25 years it died and needed to be replaced. Thankfully I planned for it by making my scenery lift out. The top photo shows the scene involved. The photos that follow show the sections lifted out. They all lifted out easily in less than 5 minutes with minimal damage. The tunnel portal will need some touch up, but even the module that has pink foam showing that is sitting on the floor is okay. The pink foam is below the plywood when in place on the layout.
I thought you guys might find this interesting to see it come apart.