So after talking with Plant11 and coming to a compromise, we both concluded that the best way for small cannons to be used on turrets for historically accurate early-1800s warships is to replace the black wool with Polished Blackstone I have yet to see anyone use it on any crafts very much and I think it'd look even better and more metallic than black wool. This change would also mean that Polished Blackstone would be added to the turret blocks list.