That's some very useful information Mike, thanks. I was planning on using an already assembled lock from the beginning, not sure I want to even try to build the lock myself, well, ever. I was also aware of the different versions of the rifle itself having read all the information on Rifle Shoppe's website, as well as speaking with a friend that actually worked at Harper's Ferry NHS a few years ago. I however was not aware of the breech plug issue, how difficult is to to notch out the breech plug? And all things considered how did the rifle turn out?
I am kind of leaning towards the TOW kit, if for no other reason than it seems I can get a fair amount of the metal work (sights, tenion, barrel rib, and ram rod pipes) done on their end. TOW also seems to have almost everything in stock right now, which is a bonus to be sure.