Small Scale Military Headquarters

decided to work on getting the guns to face 12 o'clock instead of a spread of 11 to 1.

The Inner cannons were easy, but might be too long..and I am not sure on the correct size for the outer 2cms.

Anyone got the right sizes for all 4 guns in 1:32?

I don't know any reference that shows the length of the protruding barrel, so your best bet is probably to do it visually.