Hi from downunder.
Just a thought here regarding the handrail stauncions. In my Model Railway business we were using chemically milled ( Etched ) Brass and Nickel Silver components, but they can also be done in Stainless Steel. Some years ago I had a bunch of stauncions done for a 1:24 scale tug in brass, and no drilling required. Not a real cheap option, but when you weigh up the time and stress it takes to cut and drill the number required for this Seabex project, it may not be that expensive. A problem here might be that the sheet used is normally from .012" to .020" ( .5mm ), but if they need to be thicker they can be doubled and sweated together. They can be tagged in pairs on the etch and folded back on each other. A lot easier than cutting and drilling holes that rarely go where you want them to be.
I was using a mob in the UK called Chempix, but you need to find somebody who can do the artwork for them to use.
It would be so much easier if all handrails were the same, then it would reduce the number of phototools required for the etching process, but there's probably somebody in the UK or Europe already doing a range of etched parts. Just a matter of finding them! Then the holes will generally be in the wrong place for your model!
If I can find the stauncions I had done I could put up an image as an example, if I knew how to do it! I'll have a look tomorrow.
Ian.