Hello chapparel -- and welcome to the Forums!
You will need a new 2-way fridge (110v & LP) if you wish to camp under a mix of conditions. Adding the fridge to axles, tires, probable hot water heater & furnace replacements, I am seeing $4-6000 in expenditures just to satisfy installed equipment basics. Then materials for you to remake cabinets, new plumbing & electrical ... Whew!
It sounds like plenty of chance for water to get inside if a vent and the door were removed. This lack of care has probably resulted in other water intrusion problems. This sounds like a huge job -- maybe even a shell-off restoration. I'd suggest doing some research in Classifieds here. I'll bet you could avoid 2/3d's of the labor time and find a unit with cabinetry intact and much of the equipment still in working condition -- and probably for a fair amount less than your new materials and equipment price list. The Safari will probably still be sitting there long enough for you to research your options.
Take a look at the
Vintage Airstream Photo Archives and their
Price vs. Condition page.