LuVerne,
A couple tips, albeit from an amateur.
Did Jack drill the RR hole for you? If so, you might check the thickness of the web between barrel channel and RR channel. I try for 1/8” or even 3/32”. Slimmer is better. If Jack drilled it, you can bring the barrel down at this point before going further.
If the RR hole is not drilled, then leave the barrel channel alone and scrape the RR channel to get desired web thickness. Then you can drill.
If you like the web thickness as is, ignore the above!
If you haven’t got them already, couple of recommended books like Gunsmith of Grenville County and Art of Building the Pennsylvania Longrifle. Check out Mike Brooks’ tutorial here on ALR. Those, along with some excellent instructions from people like Jim Parker, helped me understand relation of breech, lock, and trigger.
Breech face determines touch hole. Touch hole determines lock pan. Lock pan and to a lesser extent web determine lock position and orientation. Lock sear determines triggers. After that, blood sacrifice, lit candles, incantations (read swearing - goldarn thing rat frazzing son of a biscuit eating....), and magic makes the rest.
Enjoy the journey and please share!
Regards,
Paul