Attached is the Google SketchUp file I created. This was the first time I’ve really used SketchUp so I’m not sure if the file was created as well as it could be…
I was planning on putting my glass dish on a springy material in order to give it some extra pressure against the glass. I don’t have much room but a thin foam might work well.
That would be great to make a fuming box with your CNC! I don’t think you’d need a glass dish if it was sealed well enough… though it might be awkward getting the iodine or bromine back out of the box.