Weight is a big issue in trailers, so adding dry wall was an idea that had to be thought out along with every other future installment. Everything weighs something and if you go over that fragile weight limit, you can have some real bad axle/brake problems.
Another issue that had to be thought out was the curvature of the aluminum siding. Much like a jet airliner, there is no flat surface to lay down a sheet of dry wall. This is why every Airstream and airplane model have some kind of vinyl finish to cover their aluminum interior.
Any yet another issue that had to be taken into consideration is the fact that trailers expand, contract, and move around. This movement factor could form noticeable cracks around window sills and other mudded areas.
After talking it out, and trying to see if this was actually possible. It became obvious that if a job like this was taken on, it would be an incredible feat.
In time ideas turned into solutions, and the job started to seem plausible and worth it.

I started measuring the height, length, and width of every window and outlet casing. Checking every measurement twice, I laid each 4x8' -1/4" slab of dry wall on the trailer floor and proceeded to cut out my drawn out template. I'm proud to say I never made a mistake that couldn't be fixed.

Each screw was drilled equally, not more than 1 foot apart from the next. This job sometimes takes two people. One person presses the dry wall flat and the other drills.

Not a lot of people can put dry wall on curves. The front of the Airstream was definitely the most complicated. The dry wall needed to be cut in strips, drilled, and then mudded.

After 3 coats of mud, and 3 separate sanding sessions. the trailer had

come to life. I on the other hand looked like a

ghost.
Caulking around the window sill should keep it from cracking over time. This should look cool after I sand it down a little more. I can paint it any color I want.