I found this container ship trimaran in Pacific Maritime magazine. KNUD E. HANSEN A/S was design office proposing these con/ro ships. By eyeball it looks like that would be too much weight to get in under 1/10 magic fineness ratio on the main hull. And I can’t believe that those tiny amas so close in would help much in a beam-on wave situation. it sure seems like a catamaran would be a better choice.