Good stuff, Russ! Thank you.
I'm thinking there might be another way to incorporate a sight lock. When I build a holster, I use a French edger to carve a channel in the flesh side of the outer layer. I go both across where the front of the cylinder will lie, and lengthwise, to form a sight channel. I think it might work to carve that lengthwise channel a bit deeper where the front sight will rest, and eliminate it about an inch above the deeper spot. Then assemble as usual, wet form, and you should have a sight lock. I'm gonna try it.