Mr. Sasquatch - beautiful work.
I might suggest getting rid of that brass spacer by putting in a wood shim of matching thickness, keep two pins and glue it however suits you.
My own workmanship is not up to the standards of this site, but I am very slowly in process of turning my percussion Traditions kit (current suppliers of Spanish rifles formerly from CVA) into a Leman Indian rifle. .50 cal and ~33" barrel just right for one of his 1860 Gov't rifles. Got some antique solid brass tacks, some mule deer rawhide & read up on painting them there stripes on it. Plan one dark stripe to hide my fantastic work putting in that wood shim.
If you don't like the lock, L&R has one meant specifically to replace the Traditions/CVA one. I have no personal experience with it, can't say if it really fits.
With respect to those who disparage the Spanish rifles, well, the basic part of the rifle is the barrel. I am a metallurgist who likes tough barrel steels, and when something goes wrong the Spanish steel tends to bulge or split, rather than shatter like your favorite American barrel steel. Mr. Murphy is a dear cousin of mine & being a law-abiding sort, I prefer a barrel more tolerant of things going wrong.
Some prefer the Lyman Italian made rifles. Traditions just happened to have one that suited & fit me.