When I designed the bridge to be laser cut, I was not sure what spacing I wanted for the railing stanchions, so I had a hole burnt at about 7mm spacing all the way along both sides of the deck.
At the same time I had a jig cut with the same spacing. It included the exact location of the refuge and score marks for the heights I wanted the railings. In hindsight I should have made it double sided to allow me to do the other half of the railing more easily. In the photo above you can see the paddle pop sticks I glued to the other side to remedy that problem.
In operation it is just a matter of:
Cutting a bunch of stanchions and soaking them in flux.
Holding the horizontal rails in place with a couple of clips.
Then one at a time, holding each stanchion in place with tweezers and putting a drop of solder on the crossing point.
The brass expands each time, so you have to constantly move the clips.
Bending the wire for the refuges is a little bit tricky, but otherwise it is fairly easy with a bit of practice (which I now have a lot of).