I don't know how much help I can be, but I've got my -4 preview plans right in front of me. I don't see the distances on SK 6-4, but I do see the centerlines depicted on SK 6-1. Looks to me like 1/2" from the bottom of the skin and 4 1/4 from the top of the skin before the trim cuts are made. Hope this helps!
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Planning RV-7 build with my son
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