*but I do other auto, MC, and miscellaneous metal parts-- as long as it fits in my oven, but I don't do car wheels!
I'm often asked what's with the name anyway? For those who aren't into custom cars, motorcycles, Overhaulin, Chip Foose, etc, here's an explanation:
One-offas an adjective means 'done, occurring, or made only once', and as a noun (much less common) 'something that occurs, is done, or is made only once'. Depending on context, it can be interpreted as meaning 'unique' or 'exceptional', as you suggest; good synonyms are "singular," "unique,"or "one-shot."
The word stems from the British use ofoffin commerce to indicate a quantity of items produced at one time: "Please supply 500 off." Aone-off, then, was an item produced only once, and the current usage is a figurative application of this technical sense.
One-offis chiefly a Briticism, first found in the 1930s; it has been been increasingly common in America in recent years.