replacing inside panels and ceiling

I think you need to reassess where the water is entering. Your pictures show the top of the slide wall trim having been sealed. I don't believe that is your only water entry point. The close proximity of the air conditioner and the delamination patterns point towards a leak on the roof or between the edge trim and wall.
It would be a heart breaker to do all the cosmetic work and still have leaks. I'd suggest you have a pressurized leak test done before proceeding with the interior work.

Good luck and keep us posted.