As a Dakkite pointed out, I had the legs on the cannon backwards. I was thinking about the old wheeled gun carriage when I put the single leg to the rear. These are aimed turned by turning the complete carriage.
As this is a pintle mount it would have fallen over when shot with this configuration :- P It’s always good to have another set of eyes on these things…
Here you can see the revised model and gunner position.
