Variants with six 21 cm twin-turrets were submitted, along with the first German all-big-gun battleships; these featured a battery of eight 28 cm guns, four in standard twin turrets and the rest in single-gun turrets. Wilhelm approved the all-big-gun version on 18 March 1905, after which further design refinement was carried out, which included increasing the beam, rearranging the secondary battery of eight guns, and improved turrets for the main battery guns. The Kaiser again attempted to meddle in the design process after he learned of the Italian s, which were capable of ; he pressed the navy to build a similar vessel, along the same lines as the type he had suggested in 1903. Admiral Alfred von Tirpitz pointed out that merging the battleship and armored cruiser categories would not be possible under the Naval Law of 1900, and that the Construction Office was too busy with other projects to take on another one.