I put electric regulators in a '65 Oldsmobile, many years ago. It was a lot of work. I had new inner door skins made at the same time so I had no holes. I got the wiring and regulators from a junkyard car. I liked being able to lower all of the windows to get hot air out of the car more easily.

The people who recommend leaving 240Ds as manual as possible have a good point. Buyers often consider "home-made" additions a negative. If you do a really good job so that it looks factory, it might not hurt. If you plan to keep the car forever, it won't matter. It's your car, you have to decide. As an engineer, I'd say "go for it." Just don't booger it up so the car looks awful and only some of the windows work

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970