Don't know about that trigger.
I don't know about it either
UC. It functions perfectly as a cardboard cutout model. But of course, the model is not under spring pressure. Sear pin engagement and shape will be critical and something I will need to play with after it's built.
Maybe you should put a notch at the rearward end of the cocking lever slot to act as a safety.
Yeah, I'm considering that and two other possible set-ups for a safety. Those adjustments will be easy to make after the build. The problem with a notch is the striker would have to rotate for the cocking rod to drop into the slot. That would require the sear pin engage a differently shaped cavity in the striker rather than a simple round hole. But it's probably doable.
A shroud that is only open at the bottom might be a good idea to cover that nipple area.
Actually, I plan to have the rear of the forend extend all the way to the breech face with a hole in the bottom to install the cap. I'm hoping I will be able to put a cap on the nipple with my fingers, but may need to use a capper. I dislike cappers for some reason. Maybe I've never had a good one.