More Epoxy!
(Sorry again for the focus) You can see where I cut a piece out of the side panel to accommodate the RJ45 plug. The piece shown immediately next to the plug (on the right side) is epoxied in. If you set it there it will stay on its own and you can simply drip a little epoxy behind it and it won't go anywhere. Since it was a structural part of the side piece, it is necessary to reattach the side piece and epoxy it as well, but only right next to the RJ45 plug, because that is now the only weak point.