Someone with more experience will chime in here, but as far as I know, a shorter TT (or effective TT, if the actual top tube slopes) is what creates a more upright position because you don't have to lean over as far to reach the bars.
If you have time, it may well be worth driving a few hours to see if a WSD bike fits you better. Try out both unisex and WSD bikes--if you go to a shop, you'll start getting a better idea of what fits you. The fit calculator numbers are just a starting point. Even if WSD may be a better fit, bear in mind that there are unisex bikes that have relatively short top tubes and can be tweaked.
Having said that, I'd be a little nervous about that bike your son offered to build up. 4cm can make a pretty big difference in your comfort level. You may be able to get a shorter stem, but too short a stem will affect the handling. Someone else will probably comment on this too--and odds are they know more than I do.![]()
Happy shopping!



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