The original plan was to have a gas fireplace between the two shop rooms (the Tool Room and the Machine Room). The budget got used in finishing the shop itself, and it's not cost justifiable to put in a fireplace which will take many years' worth of electricity savings to pay for itself. So at least for now, heating is with two small electric heaters, one per room. As a result, I had room to put more shelving. As it turned out, I really needed the shelf space for tools and chemicals. I finally have everything out and in slightly logical places.