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@h2o
re cranks - erm, if you don't titghten them properly, they'll work loose and the spindles will get rounded out, meaning dead cranks. tighten up as tight as you can the first time you put them on, using a proper wrench, then put some allen key bolts in and don't tighten them up again even if the bolts feel a little loose (the cranks will squirm a little up the taper as you use them, which is what makes the bolt loose, but they're jammed tight onto the spindle so they're fine).
chainline - if its for the kuwahara, best thing is to assume the same chainline as you'd get on a track bike, because you'll not find a 126 rear hub - is a lot easier/cheaper to just squeeze in the rear stays to fit a 120 hub.
btw - chainline was okay but noisy when i was running some cheap sugino cranks. when they broke i bought some miche - and the bb they come with can be dialed in/out, which made it a lot easier to get a good line. now it's very quiet... of course, no reason you couldn't get the cheap cranks and the nice miche bb, it was hardly the most expensive bb.