The lathe we spun the horns on is the one I think you are talking about. Art took the head stock, spun it 180 degrees, and and faced it the opposite direction. It now faces to the right off the end, opposite the ways. This was done because the lathe didn't have enough swing to handle the horn body.
Art then took off the tail stock from the wood lathe and mounted his little Sears (Atlas) metal lathe to the now empty ways. So as you look at the whole thing, it looks like the metal lathe has an extra head stock on one end. Take a look at pics 2,3,4 on part 1 and you can probably see this. Whether you can do this on your lathe depends on how slow you can turn.
Regards,
Pletch