Here some weapon design from my alternate history book "Au Bord de l'Abime" (At the Edge of the Abyss) avaiable on Amazon:
1 and 2: Ise class Battleship are converted to antiaircraft battleship.
3: The Panzer V ausf.G2 « NachtPanther ». A variant of Panther.
4: A little variation of the Me-262.