In 1944 a design for a battlecruiser was ordered. The ship was to be smaller and cheaper than the O-class BC and should use the new 12" gun within a highly automated turret. The design should reuse module from the P-class cruiser.
The Q-class BC is a lenghtened P-class with 12" triples, 5" DPs but overall no very spectacular design for a 1945's ship it looks somehow like 'oldschool'. Not a bad ship, not a weak ship, surely a counter for the Alaskas, but due to the much lesser armor an easy prey for fast BBs (if they can catch it...). The old BC-problem, you know.
The german OKM did like the design, but the need wasn't there. Smaller navies showed high interest. Argentine was satisfied with their Rosas-class BCs. Turkey liked it as successor to the Yavuz. Even Spain was thinking about building one or two at their own yard with german help. But all orders were stopped, the dockyards had to go on war production for the Kriegsmarine only. Only two years later, the Q-class was obsolete. After viewing the german navy introducing sophisticated weapon systems like radar-guided aa, SAMs and SSMs the all-big-gun ship was out. Smaller ships, armed with missiles got the highest interest now.
edit: hmmm, something has happened to my template. I'll correct that.