Nice looking holster. I don't understand why you think you need all those T-nuts. The stitching should hold it together just fine. (You would stitch closer to the barrel without those nuts.) You made an extremely thick belt loop - I think it could be a lot thinner - and maybe because it's so thick, it's rounded at the end. A thinner version would allow you to make a "box" or rectangle shape that would fit the belt without wanting to turn. Spend more time on the edges if you really want to make it look "pro".
Maybe I'm being nitpicky, but this is the place for constructive comments. I hate when everybody just replies, "Nice".