I have a mate who is making the 75ton version from scratch and he has drawings from somewhere and has had them printed about 9 feet long!. It's a massive beast but quite impressive. I will try to find out about drawings and any other info and pm you. At LOWMEX last year there were 3 in different gauges as well as the 75tonner. Look on YouTube for Lowmex 2023 you should be able to see them. The guy who owns 17D is also working on a 75 tonner