Greg,
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First, if it was me, I'd follow Chip's advice: Buy it.
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But if you must make it, then it isn't just the dovetail plate your interested in, it's the radius blocks. As to them, the radius and the (angled) mounting hole spacing can be derived from the OTA itself.
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Optec Inc at one time had a drawing posted of the profile of dovetails. But their website has been revised and the drawing seems to have disappeared.
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But take any standard dovetail and make a few measurements: the width of the dovetail itself (not the top plate) and the angle.
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Mark Christensen
