General personal changes and bullet resist Biternest

Flooring removes decoration, ammo-magazines will hold 15 bullets
Crates and wagons, smaller, expensive locomotives,
increased pollution from factory (approx. 2x) and ovens (approx. 2x), Power pole plus, underground tape +2
Handcraft speed slower, Pumps weaker, vehicle pick-up times much higher (maneuvering required), Steam engine less efficient

Biter Spwaner bullet resistance is much higher, you will need explosivs to destroy a nest