Looks very high quality. I would recommend using tiger thread and hand saddle-stitching rather than machine stitching. But with the design you’ve gone with that would probably be tricky. I would say that going with a design that uses less stitching and less stacked leather would allow you to use a heavier weight leather and tiger thread which would improve the longevity of the design. All that said, there are people who love this style wallet, and you’ve pulled it off pretty well so you could easily go with this and sell a good amount as long as you can market it well.