would you mind adding a setting to allow for factory-3 to be 2x or 4x bigger inside?
or adding factory-4 which would be 2or4 times the size of factory-3, can be optional in the settings or not
No, I wouldn't add this. You can never stop saying "what if it was bigger". In my opinion, mk3 is already big enough. I am adding a remote API to factorissimo soon so that other mods can add higher factory tiers