Thinking a the guns Chris, I remember as a nipper in the late sixties seeing a sailing model of HMS Hood demonstrated on Blue Peter. It was about six foot long as I remember, and obviously sailed around under radio control. As the finale of the demo it rotated it’s turrets and fired a broadside of matches. I thought it was the coolest thing ever......no idea how it was done at the time (I was about 8), but could probably work it out now.