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I've been talking about this since I was a teenager. It exists in computers, guns, musical instruments, etc.
Not cars tho. Ever. It's almost criminally stupid to seize the practicality and opportunity involved. Think of how many aftermarket industries, from huge ones to a dude in his garage making a single part, might be involved.
Sucks.
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VW Beetles are probably as close as any car has ever been to that. One of their selling points earlier on was that if your wife dinged it up, you could get replacement parts from the dealer and switch them out yourself. Fenders had about 10 bolts and cost less than $30. Then of course the variety of aftermarket parts and kits that were available for them.
I think one thing holding this back besides safety requirements is that car models don't last long enough to garner third party support anymore. By the time anyone spins up a kit the factory is rolling out the next generation. Most people don't want their brand new car to look just like the 10 or even 3-5 year old car they're replacing.