Thanks to everybody for the positive feedback!
Since I also had a lot of fun playing the quest this motivates me to perhaps write another one soon. So far I've not much fantasy boardgame experience aside from HeroQuest (some Descent 1th and 2nd Edition quests and some Space Hulk quests). Essentially I would like to add some elements to the gameplay, that I often missed in the original quests or also when playing rpg-games on console/PC: dialogues with NPCs which influence the story, adventure-style puzzles, unexpected events, good background storytelling etc. As a player I often get bored with games after some time because there is not enough suspense anymore once I can overlook the game mechanics respectively foresee all the possible options that the game is able to produce. Therefore I like HeroQuest a lot since it offers the possibility to expand the game in almost every direction you want.
You write that only the game system is needed, but you use the dwarven forge tile (I think the straight stairs are also from an expansion, but I'm not quite sure).
You're right, the dwarven forge and the stairs are tiles from Karak Varn. It's playable with the game system only since the stairs and the forge are only used to add to the atmosphere. For the complete experience

one needs the game system, Karak Varn, 2 dwarf miniatures (one painted in stone colors), a stone fragment with runes and a stone gate with runes.
There should be some sort of explantation why Tùrin is still in business in the dead city.
at I, the players will not recognize that the attack of the statues is the result of their previous actions, unless you somehow tell them. Perhaps you should make up the exact wording of the orc's curse.
Good points! I'll have to extend the storytelling.
I wondered why you seem to have had accents graves, but no Umlauts on your keyboard.
It's not my keyboard it's HeroScribe.. which produces an error when loading a quest that was saved with umlauts. I did the first notes in HeroScribe and moved on to Word afterwards (there's a limit of notes in HeroScribe) keeping the umlauts indicated in full for reasons of uniformity. Next time I'll write all the notes in Word.