Ok, I guess he just has a strange sense of fashion!
Unfortunately the 16mm lens is just a few mm too long to completely fit inside. I had to break out the little glass window, then the lens fits through the hole with the end of the lens just flush with the outside of the case.I used the foam ring that had been inside around the lens, to fill the gap and then carefully painted the outside surface around the lens, so the whole thing is still somewhat sealed against moisture.