Fixed commuter disc brake stealth motherfucker

Road cranks with a single speed chairing are likely to be lighter than track ones. I'd go for shimano 5700 as they're cheap at the moment and are stiff

How do I figure out chainline etc. when using road cranks w/ single speed chainring? Looking at other threads where people have done this (or asked about it) has thoroughly confused me...

Also do you have any specific recommendations for 29er rims?

Ta.