I started on the roof panel yesterday. Removing the inside aluminum skin by sections. The panel is made up of four sections with seams connecting each section. I took the first seam apart but have not decided if I am going to take all the seams apart. I debated whether to do the outside or inside and chose the inside; no real reason. I am using a couple of machetes to removed the aluminum from the foam. They are working great - good reach, and get some leverage, and not bending or stretching aluminum at all. Got almost halfway in a couple of hours; moving faster than expected.
Have the roof laying on a few saw hourses. Will put some lumber under it the next time I work on it as the roof is losing its stability as I remove the ceiling panel. Looks like I found an adhesive to glue the panel down to new roof. Not sure if I am going to remove whole panel or not. I am going to look at it this week. The foam on the drivers side 2/3 way back was wet but when I removed some of the interior screws on the roof lid, they were rusted so am leaning toward removing whole panel. Not sure if the leak came from the sides or not. I did find a pin hole on the exterior side of the lid at the section where the foam was wet. Not sure that could let in that much water or not. Here are pictures of the roof: