David, thank you for your kind comments.
If you are into O-16.5 I can recommend the kits from Locos-n-stuff, the Peckett seen in #75 is also from the same stable, albeit that kit was etched brass.
The 3D printed body is fine, and the chassis runs extremely smoothly, although initially I had problems with the drive belt slipping. This was cured by fitting a slightly smaller drive belt, available from Nigel Lawton 009.
I had to source the mesh for the radiator grille (ebay) and I have added brake shoes on the rear wheels (intended for 4mm scale wagons)
I don’t have a photo of the Ruston chassis, but here is a scratch built version which is very similar to give you an idea of the drive arrangements.
I had a similar problem with the belt slipping on this one, but this was cured by fitting a larger diameter pulley on the motor shaft.