Richard – I set out to make one of these many years back. There are numerous mistakes on the drawings, one that springs to mind is the position of the brake hangar pivot holes. There are also errors on the valve gear but it's too long ago for me to remember where and what.
I was told that there was a list of errors published in Model Engineer and after contacting them John Crisp who owned Reeves at the time located a copy and sent them to me. Whether you would get the same response now I have no idea but John was very helpful indeed.
It was at least a page, possibly two as I recall and detailed the errors and dimensional mistakes. Unfortunately I can't tell you which issue of ME but I can say with certainty that it was published.
If you get your hands on the original articles you will find that the error on the brake hangars mentioned previously do not get dealt with until the last instalment!
Good luck with your engine but do check and double check before machining those important dimensions.
Regards – Ramon
Edited By Ramon Wilson on 09/07/2017 16:01:06