I Have only just read your article today. I was looking for some info on a couple of Judith Edge North British shunters I am building for my Bonninton goods layout.I built a hunslet about 10 years agoI had the same problems but I managed to finish it . A picture of it can be found in Railway Modeller Dec 2004 P 683 and Railway Modeller November 2009 I am still running it today and I have no problems. I used to build MTK kits many years ago as well as some of the early Ks kits so building this was a doddle.