I am not sold on this project coming to fruition yet. I just started going back to university, and am currently unemployed.
I do not know a lot about motorcycles, yet. But I am researching (i had no idea about shaft drives, thanks!). After posting the Yamaha i found yet about possible donor frame (but there listing is already gone).
I definitely think i want a cruiser style frame.
As for kW, i plan to use this around town, and out to my dad's farm. I will be taking back roads for that, with a 55mph/88.5kmph speed limit. So nothing to crazy, just enough to carry my fat ass, the frame, and groceries. Maybe a sidecar (but I think those primarily attach to a classic/standard frame) so i can bring my dog out to the farm too.

Dog tax, she tore a ligament in her knee, and is on light activity until surgery. So instead of morning walls she gets pulled in the cart.