Unless a gunsmith is going to fit the firing pins for you, I think at best you'll just be in the ball park. I think you could get a couple of turnings based on your drawing, verify it, maybe request things a bit long for final fitting. I'm probably seeing it wrong, but before going on, maybe figure out how the firing pin is going to be retained, and if any of that room in there is for a spring. I'd kind of figure on knowing which way the firing pins or gasses are headed if you pierce a primer. Best of luck with it.
