The Craftsman Collab is the idea of an upgradeable town/castle gate, requiring the chiseled hands of the mason, the woody wits of the carpenter and the iron will of the blacksmith.
Together these three craftsmen could build the ultimate defense for the weakest link in any town wall!
This is something that you wouldn’t place on every house, instead building one or two on the sturdy town walls to grant access and provide defence against invading forces.
Each part of this structure would appear in the workshop of the three craftsmen. These parts: the draw bridge for the carpenter, the huge, arched town gate for the mason and the iron grid for the blacksmith could be added to the gate after completion.
You would have to first place down the gate then add the other two components after it’s built.
Imagine a battle:
The closed draw bridge would require the attackers to either use siege equipment like catapults or magic to break in, or they could start filling up your moat to get to the gate. Then they would face the strong iron grid and a wooden door further inside. While they tarry trying to get in, your archers from the walls above would rain death down upon them.
NOTE: This is an idea of how your craftsmen could work together on a single structure. You could omit the draw bridge or the iron grid, depending on your economy, the terrain or your aesthetic views. Further more, you should be able to place the bridge and the grid elsewhere, they shouldn’t be attached only to this structure.