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I don't have the funds to start a new project at the moment but that is the kind of thing I might look for in a few years time! I would certainly like the horizontal rear dropouts so I wouldn't have to use a chain tensioner.
I normally ride 58 cm frames but with long stems and I tend to push the saddle back, which makes me think that it could be worth experimenting with a bigger frame like that one day.
Good luck with the sale!