The most important part of a battleship, has always been it's primary armament naval guns:
In the case of HMS Hood, these were 15 inch calibre - and are regarded, as some of the best naval guns, that were ever fitted to a battleship. Every single sailor, and every single system on-board HMS Hood, was there to serve these guns - to ensure that they could open fire: at the right range, at the right time, and at the right target! They were the most heavily protected part of HMS Hood - with turret face armour being 15 inches thick. The turrets sat atop the barbettes (the vertical cylinders), that were themselves protected by armour, of up to 12 inches thick (thereby protecting the shell supply chain). Hood's two forward naval gun turrets (referred to as A and B), are also somewhat unique in their decoration. At this time, A turret carried a red circular flagship marking - and B turret carried her Spanish Civil War marking (the blue/white/red stripes). Towards the back of each gun turret, is it's local control range finder - which adhered to a general rule: the wider the better, as a wider range finder, tended towards increased target accuracy.