From the builders of this unique offering:
As timber engineers, we do get asked to build a lot of unusual things – things which other framing companies couldn’t even attempt. This was, perhaps, one of the more unusual.
The ballista was successfully built and managed to fire a very heavy stone ball some 127 yards. (Remember, these things used to successfully lay siege to entire cities.)
Also a YouTube video of the Ballista being build and fired:
