I feel that a particular topic has been left out of this conversation .
As leather workers, we are all copycats at first,.and with time and experience, we become designers.
Many of the beginners of this forum are asking for information when it is already available on the Web, but they are unwilling to do the research themselves.
A while go, there was a thread concerning the French rolled edge on a wallet . I suggested that the poster do some research himself, share his results with us and we would help him along.
The poster was unwilling to do the basic research that it would take to develop the minimum skills and advance his project along. . I was roundly criticized and the thread was closed.
We are now facing a similar situation. A novice is asking for complete instructions and information, but he is unwilling to do the basic research himself. I would suggest that he make the gun holster, show us his work, then we can use our vast collection of knowledge and experience to help him clean up his design . Through trial and error, we gain valuable experience; we've all done it before and will do it again.
My perspective is easy to understand. If you are willing to put in the time and effort I will gladly help you.