Ah, but that's a reasonable price for something as low-key exotic vintage as an '80s F-150. They're beautiful cars, just like in the article photos. A decent quality Power Ram 250 can go for $35k (and they'll run for another 500k miles in that condition) so 25-50k for an electric restoration isn't that bad.
Cost is not the only factor, the other one is time.
Merely getting an old, broken vehicle back on the road is lot of work. Completely restoring a vehicle to like-new is an order of magnitude more work. Adding in an equipment swap from one version of a model to another (maybe auto->manual swap, or V6-V8 swap) is again so much more work.
Complete conversions like this take an insane amount of time. Probably months of time working on it full time. Part time, you're looking at a multi-year project. There is going to be a lot of trailblazing going on here, and there might only be 3 people in the world who can help you answer your problem.