The concept for attaching the Linhof board to the Sinar board is as I would expect, but I'd want to know whether it correctly positions the optical center of the lens at the geometric center of the square Sinar board. I don't know what the magnitude of Linhof's offset is but IIRC it's below the center of the Linhof board. This photo shows an obvious offset that seems to raise the lens by some magnitude. Sinar's adapter can be seen on p. 4-8 in the pdf link in my post #7; an offset is not visible, but I'd trust Sinar to get it right. If you found that a wide angle lens cannot be focused, then a bag bellows (455.36 p.3-9 in the pdf) would solve that for focal lengths down to about 75mm.
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