im pretty sure you can run racks or fenders, i dunno if it has eyelets for both...ill have to check my bike,
but you should have no probem with the canti's..setup is easya nd they work great.
as far as sizing goes, i am 6'2", 34" inseam, and have a 58...its a bit too small, so i would say that 56 would be too small for you as well.