This is the number one question people ask when getting on this server: "How do I get smeltery on this pack?" "Where do I get smeltery bricks?" "Can I not complete smeltery quest?" "Quest takes me to empty location?" Please, please add some sort of guide book on spawn to give a hint or let people know that they need to go to spawn for those items.
A tooltip on the smeltery controller would probably be the best thing, as most people would already be at their crash site when they first start thinking about making a smeltery and the fact that you need to go to spawn to get it would not be apparent at that stage, so people who hadn't seen/remembered your directions at spawn would still be unaware and would still have to ask in chat.
Agreed, also any sort of tooltip or help for the quest that directs you to the coordinates (what would be the city in single player mode) telling you that the dungeon/sewers is located at spawn would help. That's the kickoff for that whole process.
I took the liberty of adding signs to the shuttle before it crashes, and another at spawn explaining it.