Re: chest holster
that one looks very nice but I'd be worried about the gun falling out; with all the sewing I do, I still use almost exclusively plastic or leather for holsters as the fabric can stretch enough to allow the gun to slip free of the thumbreak and fall out. Did one for my SP101 but it's verticle on my duty belt so it won't come out without some serious tumbles.
That same design canted upwards a bit, say 30' even would be much better to keep gravity from yoinking the gun, just my thoughts.
"Loud noises don't end gunfights.... well placed shots do."