Far be it from me to question your business sense, and I do understand the attractiveness of making something that could be used to retrofit about a bazillion stocks! I get it. The lock looks great and I'm not even commenting (re the retrofit angle) about 'guts' or the externals. My concern is trying to cover an original unmodified Siler plate when the original Siler nose is excessively tall top to bottom, and the lock plate height immediately behind the pan is also unattractively tall proportionate to the overall lock plate design (on the Siler, not yours).
Your pan alone is 1000X better than the clunky over-square Siler pan.
Also just speaking for myself since you posted this all here and I assume desire commentary (and buzz

), I *personally* find this era of lock looks best when the cock and frizzen are juuuuuuuuuussst slightly taller than you would expect on a plate of the given size, proportionately. Oh the humanity, in other words, the lack of absolute 'golden mean' perfection. Again, just me. And ditto for when the frizzen kicks forward - I don't like to see mirror angles between the cock at rest and the frizzen kicked open at rest. I like the frizzen kicked forward a bit more in a wonky way.
My entire last paragraph is just musings, since I'm not the one putting all the work into this!
It really does look fantastic.