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Here is my suggestion: Chuck up a 3/4" coving bit in your table. Adjust your bit height so the bottom of the cutting edge is at the centerline of your wood. Adjust your fence to reveal part of the bit and make a pass. Flip your wood and repeat. Keep adjusting the fence and flipping the wood until you have removed the depth needed. Odds are when you try fitting it to the roof you will need to do some hand chiseling for deformities in the metal anyways.
 

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Robert, I misunderstood and thought you were cutting on the outside of the curve. Here is my suggestion: after you cut your inside radius attach 1/4" hardboard to both sides of your 2 x 8. Cut a smaller radius for a bearing guided bit to follow. Make a pass on each side and then increase the size of the radius, repeat until the template radius matches your wood. Easy enough?
 
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