I agree with your proposed problem but think we as a community need to flesh out the solution really well. What about creating module slots for ALL vehicles land/sea? Specifically for this idea, maybe for a canoe a shipwright could craft resin glue? It could be made from wood pulp, adding this is a “fuel” that increases speed or goes into the new maintenance side of things? Or maybe make static upgrades such as steel rudders rather then iron to turn smoother? Steel props could reduce maintenance and fuel consumption? Exhaust upgrades could reduce pollution…? Maybe instead of an actual sellable item, ships have to come into a shipwright to have the shipwright do labor? Somehow set that up on a contract board?
Zachary Frederick Module slots for ships actually sounds like a solid idea and tbh there is so much more they can do with the boats/ships. - More Storage Upgrades - Faster Speed Upgrades - Better Turning Upgrades These could be different then the upgrade papers we're use to as well could be components you snap into slots on the ship to tune things on it. Should be available on all but the canoe, but they could also create better paddles for the canoe that work the same way.
I think one product realistically heavily linked to shipwrighting is cordage, and cordage could easily be used in a lot of recipes, including furnitures, materials, tools, and some industries.
Using shipwright products in other industries is thematically somewhat odd. The upgrades are ok because they're game logic anyway, but I think most recipes should keep some semblance of realism.
Seafaring club for culture) But more realistically: 1. Ships are in fairly hostile environment (salted water) and need periodical maintenance as well as removal of sealife from hull. So a shipwright can be either providing such services or selling consumables to service vessels. 2. Pumping oil from deep sea probably can require at least something marine related 3. Some rare fishes (or whales?) can require single use armaments made by shipwright 4. There can easily be naval themed early game decorations, like wooden ship models 5. Specially treated wood made by shipwright can be used for water mills and for some of the furniture.