2nd question

The operational concerns of the C&TS do have a lot of influence on how cars are rebuilt. But for now let's not worry about this. Let's say we're running the car somewhere on a simple loop. Also take money out of the picture.
So you are restoring a car like a caboose or outfit car that needs a lot of work underneath. Maybe the sills are rotted, broken, or missing. A real basket case pretty much. You aren't going to be able to fix that without a complete teardown. That means you rebuild with essentually all new wood.
But ir also has an interior that is pretty much intact. It might have many years of wear and evidence that somebody actually spent time there. How important is it to save that fabric ? As I see it, there are 3 choices:
1. Tear everything down to the frame, trying to keep your options open for using the original wood to rebuild the interior.
2. Use steel, splices, and maybe bandaids on the structural members to try to keep the car intact, but runable.
3. Let it sit. You would rather not destroy the historic nature of the car, just to have it able to run.
I think you make this decision depending up what kind of museum you are. What do the rest of you think ?