And here's the updated version of
Graf Zeppelin in 1943: A new atlantic bow, a tube mast for flight- and gun control and a funnel cap to keep the mast top clean. All 20mm singles were replaced with quads and radar equippment added. To counter the additional weight, torpedo bulges were added on both sides, but with different steel thickness to stabilize the ship.
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Any help and source material is always welcome.