It should be possible to make some way for the doctor to treat himself for poison, and also to craft poisoned daggers, but I'm very busy with other parts of the mod at the moment; the poisoned daggers are supposed to be rarely used, only when someone is valuable or dangerous enough to hit and then run away from. The price of the scalpel has been cut rougly in half for the next patch, as well as making it easier to make money. I don't have time to make and keep updated a list of crafting recipies, but they are all very simple at this stage: everything uses either sticks or poles depending on how long the wood part is, the different sizes of iron bars depending on how long the metal part is, and boards for flat wood parts; there are no other items that are used for crafting (yet). When you fail to craft something, the error message will tell you if you don't have the right resources or if you don't have high enough engineering skill.