This is really great stuff!
While I spend a lot of time with 19th and 20th Century materials and hardware, about a decade ago I ventured into a real 21st Century project when asked to special order completely synthetic casing to be used as trim outdoors on a commercial building louvre.
The piece you see in the video can be cut, drilled, nailed and painted just like ordinary wood or metal.
It is also completely rot and insect proof.
I had a chance to inspect the installation about two years ago and it is as good as new over a decade later!
Wow! I found the original project install picture in the archives! The keystone breaks are PVC and the radius connectors are flexible synthetic 4 1/2 inch “colonial style” exterior casing…