Your interior looks amazing so far! Your work and research have inspired me to follow a similar route. I was able to find 3 Joe Brown helmets and all have a slightly different liner. The closest liner to the original that i have looks just like the very first one you posted in your #1 post.
Anyways, the helmet comes with chin strapping that looks dare I say exact to the helmet strapping used in the screen used version. When i measure the strapping I get 17.5mm in width and it fits just perfect into the cradle slots, with a very slight pinch. I took a few photos to illustrate my babbling!
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Also, I removed the original strapping support and will be using it as a template/measuring source when I construct a more accurate strapping set-up. I can provide measurements if anyone is interested.
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Sorry to Hi-jack your thread Andy, keep up the good work!