Ninja still too static, it is unique unit, which can attack or investigate city from aboard the ship,
I was thinking about something like
or
https://sociorocketnewsen.files.wordpre ... =640&h=450
your cannon is very similar to Bombard:

- I think I can it just rename to Bombard, because current image is ugly downscaled 3d model prtscrn.
Difference between bombard and cannon are huge, like between artillery turret and howitzer - first one fire straight but can't move by own, second one have indirect plunging fire (bombardment action) and have wheels thus have (limited) mobility.
So I need cannon with more steep angle of the barrel, and with better visible wheels.