V169 Old Motorhome has One more leak

It took long enough but I'm pretty sure there are no more leaks. It has been in a few good rains and so far it's stayed dry.
This is a 1975 TEC motorhome. The model is LARK. It is build on a 1975 Ford E350 Camper Special chassis. It has a 460 CID engine and a C6 transmission. It is a pre-emissions vehicle.
It's 21 feet, bumper to bumper. I bought it in Sept 1991 and used it occasionally for about 9 years. It's been setting for the last 20 years. Now that I'm retired, I think I'd like to have a small motorhome to mess around with. I will not be restoring this to pristine showroom condition nor will I be going ultra modern. I only want it to be useable and reliable. Mostly for my fishing and metal detecting trips. Basically a cabin on wheels.