Tools, Crafting, and Research Rules

I emerge from the tomb of ages to supply you with a thing made for my homebrew setting games, but which might have use in your own material.

(I'm not dead, just blasted with a million things to do. Urban Arcana and the adventure module are still in progress.)

Enjoy it here, constructive critique is welcome. I'm certain I retread some ideas explored elsewhere.

As it relates to some potentially-unclear things:

• I use an injury track system in my homebrew, which is what the tonics that cooking produces are meant to help with.
• The "based on product" values for the potions and magic oils use a chart I have in my DM guide for the setting, but can generally be spitballed as 1/4 the cost of the potion/oil on the open market.