Mystery fireplace

In one of my previous blogs I mentioned our little building only loosely associated with the household. In fact as can be seen from the picture it is about 30 metres away and on the other side of the road. It is far closer to our neighbor`s house or to the old barn behind us  How it came to be on our title deeds is puzzling, and my theory is that someone lost it in a card game.We have never used it for much having other batiments more conveniently sited, though we did use to use it,rather cynically, to store our gaz bottles.
  A few months ago we noted that a beam had broken and the roof had sagged dangerously. As I didn`t fancy going on it we had a builder reroof it for us and the roof is now splendid, with three skylights added. Previously the stonebuilt cabin had a hayloft floor only just above head hight and was dark and spider-infested. The floor has been largely removed as it was rotten,and the spiders moved out while the roof was off. we now have quite a pleasant little shed and are scratching our heads what to use it for. Has anyone any suggestions?

  One odd thing has been revealed by the suppression of the floor; a large and well-constructed fireplace on the back wall, though the chimney has been tiled over long ago. I don`t think the place ever served as a dwelling so the hearth is odd. A smithy, perhaps? The old owner of the house obviously used it as a workshop but there is no power connected. He did however get round this by an ingenious machine which you can see on the right You turn the handle and the little grinding stone can still be used to sharpen a blade. That`s what you really call bricolage!