Decided to do some bezel and masking work today.
First I started out with the disk that's going to mask the rotational area of the main monitor. I settled on foamboard as it was thin, very light and quite rigid.
Marking out a 26" circle without a compass is a bit of a pain, but this worked out

Creating the opening for the screen was a challenge as the monitor's outer dimensions share the center of rotation with the circular mask, but the screen itself is offset within the monitor bezel so I had to match that offset within the circular mask to make sure everything turned inside the tight frame exactly right.
Test fit, seems like my measurements and math were right (that's a first)

Making the art for the circle required some of the same gymnastics as I wanted a fully black frame masked around the monitor screen.
Large format printout at the local Staples

Time to see if it all lines up as I thought it would...and phew yeah it did.

Lets drop it in place and see if it all looks the way I hoped...

Pretty happy with the outcome of this, the disk is stiff and level without drooping and the finish of the banner paper they used to print it gives a nice matt surface.
Next, the bezels for both areas.