I finished paint on the HBK's today and just making the last few items such as these hip rails. They get made last because ultimately they're are hard to see and easily squished.
I use 1mm brass wire then made a simple jig 4 holes and 2 grooves to hold everything in place while I soldered them together. I then file down the solder, tweak everything straight before they get a rusty paint job. I've learnt the best way to get the rails nicely seated is to use a temporary spacer so you can just push the rails in and the spacer ensures an even gap all around.