You made a good find as obviously someone took very good care of your MH. We have a 1990 345LE that came factory with the same exterior paint scheme.
It's probably been a few years since the battery tray on mine slid in & out as easily as yours seem too.
Our interior layouts are just about the same except mine has twins and the door for the toilet opens towards the cabin and latches giving us the same large bath w/shower then also has the accordian door if you choose to seperate the bath from the beds.
I'm not sure what all the LE designates as mine has cloth seating from the factory (far as I know) that has held up remarkably well through the years.
Thanks for the video.