Please add any resources here as comments and I’ll add them!
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I had done something similar the other day, and I see some overlap, but yours if far better organized. Loot links as you see fit. Thalian Musings: Gathering Resources for #Dungeon23
The Dragonsfoot forums have lots of discussion, which may see a resurgence with #Dungeon23. Megadungeons - Dragonsfoot
Same goes for the Knights and Knaves Alehouse - a dedicated Megadungeon forum. Megadungeons! - Knights & Knaves Alehouse (knights-n-knaves.com)