I have a question ;
Have you test fired any of those guns yet ? LOL.LOL ! Note . I found that on most of my larger sail vessels they are easier to rig . IF , You build the Taffrails and then drill and place belaying pins .You do know that the reasons they used those pins don't you ?
When a line was mounted in the standard way you put a lock loop ( reverse ) in them. Need a quick release ? Pull the pin . Viola ! Loose line gathered up and used for setting or reefing . Now that same system can be used in 1/96 to mount those lines . Plus it gives a more convincing look to the use thereof .
Here's another point to consider .The Cascabel ( The ball on the end of the cannon ) .Was rigged with a line in battle to help stop the gun on recoil . Many times the recoil would cause the iron rings to pull out . Especially if the gunner double charged the weapon , which was done sometimes .
Every effort was used to ensure they didn't get a runaway gun . Plus rigged to the cascabel the gun could also be secured better in stormy seas .
Here's a P.S for you . I found on my R.C. Models that using black to shield light sometimes backfired in variation in the color of a panel . So I did this . Where there was a light I installed a disc of aluminum behind the bulb and used sky grey in a ring outside the bulb then white . Works great !
Someone told me once that they read where they would use strongbacks across the Gun doors inside to run the guns up against in rough weather . Each strongback had an indentation that matched the Muzzle end of the gun . I don't know if that was or is true or not .