I have had my
Caravel for almost 20 years. I did significant work the second year I owned it, and it has been very little trouble since then. The original layout was a dinette in the front, and a gaucho on the side.
There was one major thing that I was tired of, and that was folding the gaucho out into a bed every night, and folding it away in the morning. Often we would fold down the dinette into a bed and just leave it down for the whole trip, but then we didn't have a table to eat at. So I finally decided to remodel to a permanent bed in the front (using a matress from a modern Bambi 16) and a dinette on the side. My goal was to make it match what remained of the interior and make it look as original as possible, because I love the feel of the trailer.
While doing that remodel I decided to include a reversable install of a composting toilet, to help relieve the anxiety of camping with an 8 gallon black tank.
The only other major thing I included was an external power connection, because the old method of running a hose out through a hole in the side compartment was annoying, and a great opening for bugs and mice. I reused that hole to ventilate the composting toilet, and it is well sealed now.
All ready to enjoy for another 20 years, I hope! If you have any questions, ask away! You can see many more details here on my blog
https://steffdoesstuff.com/category/airstream/