Wow that project took some tenacious fix it attitude. Well done!
Our BF is a 2000, got it new. It is the 9.6 2500 so less compartments to lead..hahahaa It has traveled almost 200,000 miles on two f250's.
I have over the years had some water intrusion and have fixed each one.
Rear kitchen window, running lights, skylight...
There can be a leaky running light and the water will follow the foam seam all the way to the next
seam and and... So a wet place can be a leak anywhere. Had one from a front running light that left the cabinet on the passenger side bed wet along with the clothes compartment on the same side. I caught it early and no damage occurred.. I really learned about the traveling of the water.
I do have a camper cave thankfully.
Jim