I fitted my audio board to my OSSC tonight. When I took it apart I noticed the middle layer of the case has OSSC cut into it. So I traced the middle piece onto a piece of red fibre board and cut out a new middle case piece with a dremel and moved the old middle piece to the top so you can see the OSSC cutout now. Don’t know how I had never noticed this cutout in the middle layer. Not sure if anyone else has done this. I think it looks quite well and the switch works quite well too sticking up through the hole. This hole may need to be reamed out a touch but it all works well. Hopefully the pictures come up here OK.