Back to the grindstone. I was able to create a concave cylindrical face pretty accurately by just eyeballing it, sanding and keep checking against the circle I drew on the wood with a pencil.
How did I know what size circle to draw? Very simple - I just used the cookie tin as a template. Be sure to center the tin on the plank.
You can see the inaccuracy of the board thickness in the above photo, if it were everywhere the same there wouldn't be any shadow at the curved faces.Now, to get the face and thus the neck to slant 1 degree, I made a simple calculation: the neck + head is 57 cm long, and that length times the tangent of 1 degree comes out to be 1 cm. So by placing some little pieces of wood under the neck so as to tip it up by just that much at the far end, it's angled just right.
The fun thing is that this height is very close to half the thickness of the oak plank. So if I flip the neck over, with the same setup, the block glued on there tips it down by the exact same amount. So I can merrily grind away on it, flipping it over and back; and the face will carve out nice and straight, one degree off vertical.
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