Assuming you are going to use the actual firearm for molding, I do, I wrap it with saran wrap and wrap a dowel on the top for relieving the front sight.
The Hank Strange videos with Andrews are very informational, I utilized them alot when getting started.
One other note, I personally would cover the front sight with the leather, protruding out the end of the holster like the picture shows would make it more difficult to draw.
Another personal choice of mine is to line the inside with non chrome tanned pigskin.