Well I just did my FRED simulation, under optimal conditions a Colossus with overdrived beams (LRBGreens) WILL be able to broadside a Sathanas with 8 of its cannons, taking down 1/3 of the Shivan juggernaut's hull integrity within seconds. Recharge time is 35 seconds, enough to destroy the Sathanas before it maneuvers to fire back.
Anyone can make a giant ship/installaion with 60+ LRBGreens/BFReds facing one direction, but that wouldn't be realistic, let alone canon. So I'd say they would build a Colossus after Capella, they just need to soup up the beam, reactors and heatsinks then get a top-notch captain for it.