An extensive overhaul, emphasizing detailed and realistic chemistry, materials, and production. Extends the base game to marathon-style scope and difficulty.
once you get brass unlocked, you need oxygen to produce zinc which requires a distillation column and a whole set of intermediate materials to make.
One suggestion would be to move brass significantly up the tree so it does not require the distillation column to unlock (includes landfill, reinforced concrete and a number of other extra techs just to unlock).
A crude oxygen production in a burner chemical reactor would at least allow heavy armor and some piercing ammo to be set up earlier
once you get brass unlocked, you need oxygen to produce zinc which requires a distillation column and a whole set of intermediate materials to make.
One suggestion would be to move brass significantly up the tree so it does not require the distillation column to unlock (includes landfill, reinforced concrete and a number of other extra techs just to unlock).
A crude oxygen production in a burner chemical reactor would at least allow heavy armor and some piercing ammo to be set up earlier