Are you sure you've thought this through, Mr Zoat?
At that size he'd weigh over ten billion tons and given his gestures and movements are described as only a few times slower than a human's (proportionally) his limbs are moving at several kilometres per second.
This is in a world where thrown cars and lamp posts and punches are considered effective weapons for the heavy hitters. And OL's main weapons are slower-then-normal railguns.
To use an analogy, it's as if you'd written a drama set in an elementary school where the main weapons are flimsy sticks and small stones and the guy with a BB gun is pwning everyone, then someone summons godzilla. It's a very different scale.
Superman could fly right through Oceanus a dozen times and he wouldn't even notice.