If I am reading this correctly, Send it out....unless you and your equipment have the capability to handle up to 1550mmx1550mm(60"x 60") x 75mm(3") thick square plate of near 1 metric ton(2200lbs.) capacity.
The supplier should have the capability to cut it for you. That is BIG stuff for a router! Will the CNC plasma machine you have cut through 75mm Aluminum and cover the travel range to cut the 1500mm diameter?