Alexander.
How about one of these.
available from Hare and Forbes. Cost $200.00
available with different size drums and abrasive refills.
As Brent just posted you could mount a router or this on a stand with your work pivotting and have very accurate curves.
I used this method on the bearing curves when I made my 20 inch obsession clone and works well.
Just a suggestion, and you can use this for lots of other jobs later as well.
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