Thank you very much Mr. Dobson for your remarks.
Yes, you’re right, these weapons should be mounted on a flat circular platform. But I had to face the fact that, being not dioramas but wargame bases, the square edges would cut the circular shape on both sides and make an ugly join with the side bases.
To avoid that I tried with a kind of curved metal track for the rotating wheels. Maybe is not so evident because the gravel and the grass all around. My mistake.
As for the pushing gunners, again no so evident but, in the inner part of the big wheels and around the axis, the model have another pair of small metal whels rolling over the wooden frame to put the cannon again on firing position after the last recoil pushed the gun to the rear of the frame.
And this is what I tried to portrait... More or less...
Thank you so much Peter and Mabo for always being encouraging and friendly.