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As I understand it, Jasonb has taken an illustration of an existing design as a basis, and produced his own design that is intended to have a similar appearance. I can't see any infringement of the forum guidelines.
A reprint of the booklet mentioned in the above catalogue extract is still available from Tee Publishing and covers all the engines in the range with building notes as well as drawings so that is what I started with. As with my other recreations of long lost small engines I set to and redrew it in metric with a 12mm bore and 20mm stroke in Alibre, exporting some parts to F360 to make use of the CAM function to generate the G-code needed for the CNC mill.
I cannot see Stuart being fussy as the progress casting set is so cheapP.S. The last sets of Progress SH castings I saw sold for sale were £25 each.
So Jo where did you see this £25, was it from Stuarts as your first statement the use of "IS" suggests they are still sold yet the second comment suggests you saw some second hand sets for sale?
Or more precisely a replica of the Stuart Models "Progress SH"..... snip... This shot shows the results of an adaptive clearing tool path that leaves a series of steps on the sloping surfaces as they all have a draft angle to mimic the casting and one of the finishing paths has just started to work it's way down around the near bearing block boss....snip...