Working on 1/12th scale, a 6 ft man would be a six inch (150mm) figure. A safety railing would need to be at hip height, so allowing for enough metal to insert into the decking to keep it all stable winds up as 80mm overall length on the pins.
Well, I found some 90mm stainless split pins, and 3mm brass rod.
Offered them up to the boat and it totally overpowers the look of the whole model. The cabin windows are obscured by them. UGLY!
So i dont care about true scale any more, I'm going back to the original 30mm high x 1mm wire railings, which allow you to ignore them when looking at the boat.
Its all finished, going to put it back in the water tomorrow, and see if it still works.