Multi-TC + Large Furnace + Small Oil Refinery
In growth, a large furnace and a refinery are not put on the foundation and therefore they are put behind a high wall, but there they can be cleaned by craftsmen who have climbed over the wall. Here is a way how they can be built up and closed with a roof and not with bars, I tried in every way, but this method turned out to be optimal in complexity and resource costs. And of course, a nice plus is a multi-cabinet that will glue the building to itself in case the main cabinet is broken.