I got some time today to make two more pairs of shorts and write up a tutorial for the patch pockets. These are made of linen and came out really well. I made the pattern for the shorts by tracing some of Daniel's and created the pattern for the pockets from scratch.
The pattern piece isn't just a simple square shape; the success of the pockets lie in the shape's angles. I've put it up on Scribd; you can download or print it from there. Please let me know how it turns out if you try it!