You should use a routing bit to cut your patterns for a smoothe finish on the edges, or take a file, sand paper, steel wool and finish with a squirt of WD-40 to make the edges very smooth and scratch free.
I also recommend making a sight rail jig to have a better crease at the top of the sight rail, so that your holster looks less like a plastic taco.
Another item that might be something to consider is to put some sort of retention dent in the trigger guard so that your holster creates a nice "click" when you holster. This also allows you to loosen up the tension a bit so that you don't wear out your finish. The tension dent should be holding your pistol in place, not the rest of the mold, because this will cause excessive drag on presentation and wear out your finish causing potential rust issues.
For just using a few hours, this is great work, but often times, outsourcing is the way to go unless you need to make a custom holster for some reason, or enjoy molding low, thermo-temp plastic, e.g. kydex. I believe blade tech offers some sort of tek-lok item that would help with retention, because current attachment pieces you have now will break...
If you plan on starting a business doing this, I suggest developing molds to use for your molding and then doing the final fitting at the end with the pistol.