Aaron, I think my One Way is a 56... if not its a 58. Its stock setup is with fenders and 700x 35's so it may take 42's but i'm not sure about 42's with fenders. Other than that its pretty close to what you want. Horizontal dropouts (rear facing), Canti Brakes, Rack bosses midway up the front fork and on the seatstays as well. I don't know the rear spacing though.

I can take measurements of stuff on it later on tonight if you want.