More closely resembling an armored briefcase than a case for your smartphone, the Machined iPhone 4 Case by Karas Kustoms are anodized and prepared to take a fall, while leaving your phone intact. These cases also prevent the dreaded antennae issues, without even covering up the entire side of the phone.
Karas Kustoms offers the cases for $39 a piece, but was also kind enough to post a step-by-step DIY guide if you’ve got the equipment, know-how and time to make one yourself.
Very sexy looking — can this protect better than a 3DO case which actively absorbs the impact energy? I guess the energy is transmitted around the phone through the aluminum frame in this example. Is there some sort of rubber buffer between the phone and the case?