Might be worth picking up a copy of Fadala & Storey's
Black Powder Hobby Gunsmithing. They have a couple of sections on putting together the kits, with nice tips.
Here's the book I'm talking about
:
http://www.amazon.com/Black-Powder-H.../dp/087349153X
It's out of print but easy to find for $5 or less on Abebooks or Alibris. Best of luck with the . . . venture!