A very nice start on the Colossus class.
This is a photo of HMS Hercules as competed (from British Battleships of World War One, R A Burt), as you can see the angle of the anti-torpedo net 'arms', for a better word, are at a different angle, the hull does look rather flat, maybe some more shading at the bow and stern so demonstrate they both narrow at the points? Could you show us the line drawing you used?