I had already made the side panel but.......
But because I want this case to kick arse, I threw away 60 bucks of side panel and started again.
I present to you, magnet side panel! There is a 1mm pocket into the 6mm thick acrylic and then we shave down another 6mm part down to 1mm, that becomes the lid.
Then the top is bonded and polished and then bonded again to the side panel. Magnets? You won't even see them.
But hold the phone, won't the panel slide up and down, left and right?
Nope. For those who don't understand what they are looking at, the top corners and bottom corners have pieces that jut out but are level with the original window. These stop the panel going down, left or right. You'll notice I haven't gone on the cheap either, the panel features 24 magnets on the frame and another 24 on the side panel.
I am almost 100% certain that if these magnets pull 600 grams each as stated on the website, then this side panel won't be going anywhere.
If you are wondering what magnets I am using, look no further; http://cgi.ebay.com.au/100-x-Disc-Neodymium-Rare-Earth-Magnets-N35-4mm-x-2mm-/230613057210?pt=AU_Supplies&hash=item35b19bfeba#ht_4992wt_905
They cost 10 bucks and hold around 600 grams each (the ones I got are not in that link, that link just has a good pic of them).