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lesterama
Bob sent through some designs for perusal. Based on a 60 x60 (ish) to keep the headtube intersectoin of the top tube and down tube a bit tighter would mean quite a considerable upstand of the headtube above the top tube.
what I'd failed to take into acount was that an old fashioned quill can give you 2-3 inches of rise in a far more elegant way that a stack of spacers. As a result I'm going to look at going 62-63cm seat tube 3-4cm of headtube above the top tube and about an inch of height variability with steerer spacers.
Sory about the metric -imperial mash up here.