Carman, looks like you are new to the forum. Welcome to the madness! You will find all the info you need here on the forum. You will have better luck getting the answers by posting in the Classic Motorhomes section rather than the General Motorhome section.
The windows are a common repair on these old girls. You remove the fuzzy schlegel weatherstripping to make room to remove the glass. There are lots of threads on the subject. I have some posts on the subject in my thread 'Countdown to kickoff" but, there are several more, just do a search.
As I recall when I adjusted my door hinges I had to remove the interior skin to get access to the screws. Sounds to me like a previous owner may have changed something. Here to, a search should come up with several threads on the subject.