Certainly not many of these about, it is possibly the only one!
A well progressed project based on the 3" version plans as seralised in model engineer back in the 80s. The build so far is to a very good standard, the wheels are really nicely made. It comes with the majority of the castings required to finish and also the wooden patterns made specifically for this project.
Even if you dont want a working threshing machine it would make a really great look-a-like trailer behind a 6" Traction engine.
https://www.legacyvehicles.co.uk/6-threshing