As can be seen from the photo, Tony's K1a/393 no.395, was a fabulous thing. Almost entirely scratchbuilt.
It was only years later when I was able to track down the dimensions of the Woolwich Moguls that I realised Tony had made an error in the relationship between the greater width of the footplate and the cab. When the Moguls were assembled in the late MGW/GSR era, the engine frames were spaced wider, and the overall width of the footplate was wider. What did not change was the cab width, resulting in an appreciable ledge between the cabside and the footplate edge. The same applied to the tender tank, which remained the same width as the original SECR/SR design.
If you look at the above photo of 395, the cabside is too close to the footplate edge, which suggests Tony widened the cab when there was no need to. The same goes for the tender.
That said, his is the only model of a K1a I have ever seen, in any scale. Maybe it's still the only one ever built.