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If you can secure a reliable supply of "blanks" to work with you could set up a vendor table at your local car show/swap meet.
Those guys will pay for a price for an exact copy of their IRL car, or the one they wanted but never got. Their wives won't bitch about it because a $20 custom toy car is a lot cheaper than most of the shit they spend money on.
You'd have to take orders and mail the dudes their cars when finished.
Can you make money at it? Probably not much. This is something you'd have to do for fun and just hope to break even.