I have two chamfered rising plates (each with a different slope) meeting atop a post that is rotated to bisect the rising plates angle in plan view. How do I create a mortise / tenon for this joint? The post top is cut sloped/skewed, which means the mortises in the rising plates will not be perpendicular to any surface.
FYI the plates are approximating the elliptical outline of the structure.
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Joe