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for style reasons
I am not cool enough to consider such things. I just want a bike I can ride while looking straight ahead, sat upright. All dignified, like.
±1"
There's probably 3" (7.5cm for the rest of us) difference in top tube length between a large MTB frame and a large road frame, placing the swept back bars either 7.5 cm further/closer depending on that choice. Surely one choice must be preferable to the other. I'm just not sure how to work that out. I guess I might just have to go try some Raleigh Sports type bikes and make a load of measurements.
You're choosing to place your hands, feet and arse in a particular arrangement for style reasons (or, if we're being generous, for a particular combination of ride and handling). If you don't change that, then there's very little difference that the practical differences between frames the right size will make, whether it's ±1" on the front and rear centre distances or ±1lb on the weight. That's not a particular point about this project, it applies just as much to any other kind of bike until you get into high performance riding.
Not so much. Raising your torso angle cuts a lot out of your reach, making a short stem and swept back bars come to your hands with much the same squarish geometry as works for normally proportioned people on a road bike.