It could have been re-purposed for critters and hay. Around here, back in the day, everybody that had a little timber patch had a sawmill, usually a big circular that ran from tractor pto, sometimes a shake mill. Air circulation, keeping machinery dry, keeping sawdust dry (ever try to shovel wet sawdust?), portability, most were on skids, If I've seen one I've seen 20 of them quite similar. My shooting shack was re-purposed from a Mighty-Mite sawmill shed.
