1984 vs 2021 - LEGO Castle 6073 and 31120 - detailed building review & comparison - YouTube
LEGO 6080 Kings Castle Instructions, Castle
I started with some mint condition Pirates Eldorado instructions, and stumbled upon a well-priced goldmine! (More info in captions & comments) : r/lego
LEGO Black Falcon's Fortress Set 6074 Instructions | Brick Owl - LEGO Marketplace