John Cutler
Correction!
I omitted the fact that the Stanier wheels I used are 5’2.5″ diameter and not the correct 5’6″; the photos show this is not too obvious visually but it will affect the loco ride height (but it looks OK to me). Moreover it has been pointed out that the crank-thriow of these is 11″ and not 13″. This is a surprise to me as I have an ancient catalogue that shows the throw is 13″! It just shows one should double-check!
Now I am not sure which wheel I would recommend for conversion.
Apologies for any confusion.