I just ordered a fingerboard from SM, and its perfect. I was wondering how to give it a trapezoid shape, from my 41 mm nut to the 56mm end width.
Make a routing template.

Draw the fretboard accurately onto MDF or plywood, saw it close to the line then,

either use a flat, straight piece of wood clamped right up against the line to use as a straight edge for the router,

or simply plane and sand it down to the line.

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