You’re welcome to purchase the pattern and make this yourself.
If you’re planning to make them to sell, I’d actually highly suggest you alter it to use less leather and replace some of that with a sturdy canvas. Otherwise it’ll be really expensive once you add on markup to recoup your expenses — materials, overhead, etc. — much less enough to make a decent profit margin.
I might someday make such a pattern, but as this was a utilitarian item for me and it’ll last a long time, it might be a while before I rework it!