There is a working blacksmith "barn" that is locL to me that I keep meaning to go get some pics of near me, the floor is dirt and they have a working belt drive system that they fire up once in a while to power their BEAST of a power hammer. Looks just like these pics! They have a boat load of steam tractors and hit and miss engines too.
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You're gonna love the next round of 3D Printed details!
I'm casually using this as my reference example. So, it will be a dirt floor. I think that would line up with the spirit of this diorama.