Current Projects chat and miscellany

Going to try this thread for my newbie question if you don't mind. I got a road frame to replace my stolen bike, and it comes with bb and road cranks (shimano) that can't be removed. I'm keeping them and getting a wheelset built with Gran Compe hubs. Has anyone experience / any idea of how difficult getting a good chainline with this setup would be? How should I prepare to get through this without too much sweating? This will be my first fixer so yeah
Right then. Are you sure you can't remove the cranks. I've found soaking them in plus gas (anti seize spray) for 24hrs will 9 times out of 10 do the trick. If this fails then heating the seized area with a blowtorch then using a crank extractor should work. Otherwise I feel your gonna be in a hold world of pain as road chainsets usually require a b/b with a width of 116-122.5 whereas single speeds (fixed) usually need between 107-110. If I were you try and get the cranks off then see if you can remove the b/b. 10% effort 110% reward.......