Here's what I came up with for a cell phone case. To keep it sealed from the elements I decided to wet form it. I made a wooden blank to take the place of the phone. I decided to vacuum form it using a regular clothing vacuum bags. The definition shown in the pics is only from the vacuum I didn't use any tools to get it to that point. I'll go through with a bone later and get some sharper corners. Then I'll trim the excess from the edges to the finished size.