Adds 2 tiers Mining Drills, Solar Panel, and Accumulators that are costly but powerful and also lets you upgrade beginning machines to the late game machines.
What about adding an extra module slot for each tier of furnace? Currently they all have 2 module slots, what about letting the default electric furnace at 2 module slots and getting the mk2 at 3 module slots and the mk3 at 4 module slots?
