After proving my newest acquisition, the Smith & Wesson 908, was reliable and accurate enough and then carrying it a couple weeks concealed & tucked I decided it needed it's own holster. Since it fits very well in the Crossbreed SuperTuck that I use tucked at the 4 o'clock position I don't need that kind of holster. For winter carry, when I can wear sweaters or fleeces I like to carry at the appendix location. It enables a quick draw and because it's directly in front of me I have more control over exposure. I've also found that it isn't nearly as uncomfortable as most people would think.
I've made similar holsters before, but at times had problems with clip breakage. So this time I decided to go with the slightly thicker kydex I had (.080 gauge vs. .060 gauge). It adds minimal thickness, but also adds much more strength to the J-clips. The design is a single piece folded scabbard integrating the J-clips secured using one bolt/nut. The .080 gauge kydex is too thick for me to use the rivets I have, but I actually like the idea of being able to take it completely apart in case it ever needs to be totally cleaned. Here are pictures.
It fits tightly, but draws quickly and smoothly. This holster holds the gun much like a traditional leather holster does where it feels like it grips the gun all over. Most kydex holsters rely on clicking points (typically the trigger guard) which cause the gun to click or snap in and out of the holster. It all comes down to personal preference, but I'm happy with it's retention. I put together a short video showing this holster & gun concealed.