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It's not too difficult, it's not like I'm trying stuff that hasn't been done before, Winston 1.0 was based on my All City Mr Pink, just a bit beefier, and that suited me very nicely, so I know roughly what geo works best for me, and from there on in it's just tiny tweeks, as long as the saddle and bars end up roughly in the same place it's all good.
As for overlap, very similar, in that they're both road bikes with similar contact point geometry, obviously the Equilibrium can't take 40+mm tyres, but I've fully embraced the chubby tyred road bike way of life, and like to take snacks n other ride essentials so thought I'd try low trail (for front loading) and 650b x 48mm (for extra cush).
Edit: no, not canti, long drop calipers.
No, not quite. Hopefully it'll be another Winston bike, 145mm with the shortened fork (for 650b) gets my bars slightly higher than the Equilibrium.
Looking at 650b rando type frames in my size 145mm is about spot on, think Crust Lightning Bolt and Soma Grand Rando, whilst also doing away with unnecessary spacers.