Looks almost identical to my construction. I used drill rod instead of black pipe. The first problem I ran into was that the Z carriage tended to troque and twist/bend the X carriage. I did a mod by adding a "torque tube" to the back side of the X carriage. The torque tube is 2" dia aluminum clamped to the X carriage with some fabricated aluminum clamps. The tube keeps the assembly from twisting/shaking while routing. Mine is just a 26" X 26" X 9" table, so with 60" I would imagine you will run into the same issue.