I'd start with Ford. They're well known for their custom builds — what they call VSO. And they're already tooled up for production of an F-150-style vehicle around Kentucky to boot.
It won't come cheap like an F-150, but nobody can expect it to be cheap when the value proposition is much higher.
When someone comes to you with a unique custom request for something, your response is: “Nope. Not on my website, not going to do it”?
Must be nice to have the luxury of being able to do nothing. Ford doesn’t have that luxury, though. It has to answer to angry shareholders if it lets a lucrative customer slip through.
It won't come cheap like an F-150, but nobody can expect it to be cheap when the value proposition is much higher.