G'day odie,
I would guess it is about the same year model as our Swan is, 87.
Ours has had a full chassis replacement and a few more bits added.
Here is a link to ours,
87 Swan, Touche TurtleYour measurements are pretty close to ours.
Your floor plan would something like this.
Ours doesn't have the Buffet bench, which going by your pictures would be the same as ours.
From door opening to the front of the wheel arch, it is about 150mm.
Hope this helps.
There are plenty of the old girls still being dragged all over the country, me might just have to ask for a Vintage Jayco section soon