Or, you could let players involved in the dungeon run work out what the dungeon would be like and what loot they might find there? A mod would still need to manage the OOC coordination and give their stamp of approval to any plans, but one of the nice things about freeform, DW-style rp is that players can create things as they go along without a lot of constant mod hand-holding. There just has to be a lot of communication.