Stefane
I welcome your comments and thank you for the encouragement.
The printed version has already been ordered without the lights.
The lights, buffer heads and bogie sideframes are in a separate print.
I have also produced some 0.3mm etched brass jigs for positioning over the body for correct drilling of handrails over the face and sides of the bonnet. I can either do it myself or provide the metal wire for others to do.
Though I had considered designing an etched grille,I decided against it because I can not see how it can be placed in a spherical opening. So I will have to live with this compromise.
The best way to make it will be to solder wire over a wooden former but maybe someone else cam offer this refinement as an improvement kit.
Finally, let me reassure you that I have by now produced half a dozen locomotives and a number of parts in 3d plastics and I am painfully aware ($$$$) of their properties

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christo.