I've heard all this cable or zip tie buisness but has anyone ever thought of using wire? You can make hinges by bending it into a U shape and then just hooking it around the grid for extra security. Also you can use this instead of connceters, they serve the same purpose as zip-ties or whatever your guys call them and i promise you'll find away to bend them so they are not sharp! They also work as hinges because they bend! Wire is cheap as well and you can cut it too the right length, so if you need it longer you can get it! I reccomend this because it's works perfectly! The only problem is that it is not colourful and i;m sure the piggies don't mind a bit!