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looking forward to it.......the photos not the bandaids :)

I know what you mean, you are essentially making a laminated curved platen. As long as you have it well secured to the grinder bed it should work, it might prove to be quite dangerous if it comes off...

Rough calc would indicate about 30" diameter wheel, assuming 1/4 inch thickness at the spine. That will give you round 0.5mm concave in the centre of the blade. That's one big contact wheel. Yikes :)