It wasn't an easy rehab. It was an old barn-style double sliding door, and only one side could be open at a time. Most of the components were so warped they would have to be replaced, and any replacement stock would have to be custom milled. It was close to 3 inches thick. Replacement with an exact replica would have been prohibitively costly. Replaced it about 10 years ago with an overhead door that turned out to be garbage, and had to replace it again recently. It was luan-paneled and the luan panels near ground level rotted from water seeping into the joints. Then I couldn't buy an exact replacement for the lower section. I used fiberglass body filler for repairs for a few years but the rotting was spreading. The basic construction was not sound. I shopped alternatives and wanted fiberglass but ended up with vinyl. It is native white but paintable, UV and moisture resistant, and looks good (even close in). Here's a photo.

I bought the house with vinyl siding that was done in 74, replaced it about 15 years ago with new vinyl and it was a good choice. At that time I did consider the option of restoring the underlying wood and but there was too much in bad shape, and restoring the wood siding and trim would have made a low-5-figure $ vinyl-replacement project into a 6-figure $ "this old house" restoration project. (The house dates to 1858. Still have the original double hung windows with sash weights though, and most of the interior doors. Stripped and restored each of those myself.)

Time will tell about the vinyl door... probably it will be someone else's problem. But you never know.