Food For Thought (Score 2, Interesting)

Ok sounds nice and all, but heres some food for thought. In order for this to work you need both 2000ft arms to be the same EXACT length. If they are not EXACT then the whole thing wont work, but in that case how will you know? Or even better when they are making it, how do they know the gravity waves arent throwing off their measurements before its even built!