GK 4542 Battlecruiser The GK 4542 project was a 1918 design proposal for a 45,000 ton battlecruiser, armed with eight 42cm (16.5in) SK L/45 guns in four twin turrets, in a superfiring arrangement on the centreline. Secondary armament consisted of eight 15cm (5.9in) L/45guns in casemates, four 15cm ...