Big sheets of paper.. draw it out..
My touring bike (one off) We built a twin plate fork crown 1" steerer and Round fork blades an offset in the crown, so less in the fork blade tip..
It worked..
Try several on your list,
Maybe just buy an imported suspension corrected fork, see if it's Adequate ? add braze ons ...
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Last edited by fietsbob; 02-12-19 at 11:54 AM.