This has 2 smelters, 2 charcoal kilns, a blast furnace, workbench, forge, stonecutter, and 3 spinning wheels. The kilns are elevated between the coal-fed stations for convenient access. A cart can make it up the steps and through the entrance if not too laden.

The smelters are positioned so closely that the metals produced from the rear smelter are only accessible from the coal-feeding side when standing close to the stone column.

This is based on a video by Draco Invictus (Building The Round Workshop In Stone).