Semi - I'm looking at this design and started laughing to myself. Why? Because when I shoot off the bench, I have a habit of wrapping my 'free arm' around the rear bags. This puts my forearm directly in front of the trigger guard. I can just see myself firing this rifle and getting a flash burn on my forearm or wrist.
I'm not sure what the dimensions of the striker will be but I suggest making the cup of the striker deep enough to prevent such an incident.
I still have a scar on my right wrist from firing a RH flintlock with my free hand too close to the flash pan. Happened a very long time ago when I was young and not too bright. (And don't you dare say now I'm old and not too bright - cause I know that's what you're thinking.)