This is my attempt to stay as faithful to the ruined sprites of the main base in the fifth map of the tutorial as possible, going with what's suggested, while also adding ways to make engine units, solar panels, and piercing rounds of ammo for later in the scenario. You'll need to design your own way to deal with the stone & coal mix that comes out of the miners. Maybe collect some of it, turn some more into bricks, and turn the rest into walls! Try placing stone furnaces along the conveyor belts leading to your boilers and main furnaces. A handful of these will remove excess stone you don't want to get to the boilers, trains, or iron/copper furnaces.