Many thanks, chaps.
That Perkasa website seems to have gone AWOL, as has the guy who posted as Perkasaman.
The aim isn't to reproduce an
exact scale model, Rich, but that could be achieved by anyone who wants to go in that direction. The guns, bridge furniture and flare launchers will be available from Shapeways to anyone who wants the total scale experience - at an appropriate price! For example
https://www.shapeways.com/product/4YXDWLEUC/bofor-mkix-for-perkasa-1-40?li=shareProductI have these and they are truly awesome pieces of work.
Colin's link looks to be a good place for me to start for the 'handrails'
1/40 was the scale chosen for the new kit by the late, great John Rudd, MD of Balsacraft, when he started this re-creation in 1999. I'm working from his original CAD files. It's my size of model boat - easy to operate and fits on the back seat of the car. I wouldn't use a brushed motor these days but a decent 600 would probably suit.
Dave M