Back in 2006 our old 1983 rig
HERE, the interior fabric all came down in a matter of months as shown below. I had considered gutting & prepping the interior, then have a company glue all new fabric, then install everything back myself. The quotes I got were just too much considering the age of the rig. It was time anyway to get a better rig with better facilities so a year later we bought what we have today
Seen Here.
For us it was best to buy a new rig even though the old rig had a solid chassis and house. If you find the expenses are just too difficult to justify, and the accommodations a bit short, you might want consider a new rig too.