When I was renovating my Starcraft, I found Starcraft customer service to be knowledgeable and helpful. There may be no drawings that are shared about the individual framing schedules, existing only for design engineers and production managers. Then again, maybe not. In any case, most wood framed RV's are built as the good DR states. If you can build a dog house, you could frame an RV.
In the case of failed roofs, most damage starts by water infiltration around through holes in the rubber membrane or at it's edge. If left for some time, the wood surrounding the leak point will start to fail. Good news is that the membrane pulls off that easily. Bad news is that some wood particles may be attached to the adhesive on the membrane. The other insidious part of water leaking is that water travels with gravity along framing surfaces and can run for good distances. That means that what started as a roof leak may become a wall framing problem. Careful inspection is necessary.
After you have any damage repaired and the roof membrane reattached, I'd suggest to seal any problem spots with Eternabond tape. It never has to be maintained and won't crack and fail again like a caulk sealant might.
Good luck on your project!
