To make the space above our massive heater a bit more useful, I hacked together this little shelf from some second hand wood that I bought from somebody in our area. It's made entirely with hand tools and held together by screws and prayers due to the funky shape of the back side of the heater.

I cut the board to the desired length with my hand saw, took off the sharp edges with a small plane and coated it with linseed oil. Then I screwed together the very hacky mounting solution, oiled it too and screwed the board on top. I am quite happy with the result, even if it's very hacky since I am not very experienced :)