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The roof structure of a Sunrader was designed and built as a "structural insulated panel". When you remove the sheet of plywood, the foam and other elements that have been adhered to the upper fiberglass surface of the Sunrader you will have destroyed its engineered ability to act as an integrated load bearing unit. So do not gut out those materials as part of your remodel unless it is absolutely essential to do so. As the wall paneling is not stapled or glued to the roof panel structure you can remove the wall paneling, insulation and furring strips without removing or impacting the ceiling system. Logically thinking about how the builders of the Sunrader created that Structural Insulated Panel while using the fiberglass roof as the exterior layer indicates the following. That work would have been done before the upper half of the fiberglass shell was removed from the mold. The mold would have been used to keep the fiberglass supported in perfect conformation of its curved shape.t The materials will have been added in one layer at a time using gravity and additional weights to help achieve a uniform bond. The materials would have been left in that weighted condition until the adhesives fully cured. You will not have a mold to help you keep the shape of the roof in its intended conformation and you will not have gravity working for you. You would find it very difficult while working overhead to add in the layer of fiberglass that is just above the bottom layer of plywood, and against the lower edge of the insulation foam layer. Peeling ceiling wall paper and discoloration is something that can be fixed without removing that essential ceiling structure. Small areas of delaminating plywood can also be repaired without removing the ceiling structure. Redecorating the lower surface materials is fine. However removal of the structural components because you want to redecorate is creating a major engineering headache and expense that will have to be solved. It is only if you have a major failure of the ceiling where the foam and other layers have come apart from the upper fiberglass surface that you should take out the ceiling components as part of your Sunrader remodel. If you are going to add in an additional support beam to help hold up an air conditioner do it by removing only a small section of the ceiling panels, just enough to slide your beam in up against the fiberglass. Be sure your new beam is well bonded to the fiberglass on the roof and to the adjacent insulating foam as well as to the lower surface of the plywood panel to fully integrate it into the Structured Insulated Panel system. If you are going to pursue a complete gut job on a Sunrader then before removing any part of the ceiling you should have already designed your new roof support system. You should have all the materials on hand so you can immediately install them. The fiberglass of the roof will not be able to keep its shape for very long as its own weight will begin to deform it. Do lot leave it out in the hot sun in an unsupported condition. Do not climb onto the roof without the support structure in place.