I think this might be the final design - this is still a prototype, since the holster that was ordered was to be lined, so I'll be making a new one with a couple of minor changes.
I made it a tad narrower, moved the pocket higher, reformed the pocket so that the back is much flatter, and made the belt loops wider (these are just after wet forming the loops):
From the back:
A good shot of the reformed pocket:
and from the other side:
I'm planning on basing my Yaqui slide holsters on the same design - essentially an open toed version of the same thing. As always, questions, comments, criticisms and suggestions are always appreciated.