I had cracked a 125 that was rimless out of the box when I cut slots in the back for externals. The 1/2 inch glass was a bear to work with. After it cracked, I had mulled over a bunch of ideas for braces, and threaded rod came to mind. I was going to jacket it in clear rigid tubing that you can get at the LFS for a few bucks. You can do the same here, and just cover what the tubing can't cover with silicone at the ends. Should do a decent job of keeping it from rusting. hth