TOTW Northwest Trade Gun Kits are fairly easy to assemble, and only require minimal handwork. The most difficult part is the pinning and drill operations which can be mastered with a pin jig and drill press. A good set of chisels and a drill press (or mill press) in my opinion are essential for any kit.
The barrels are usually by Colerain either rifled or smoothbore.
The Lock is an Tyron Lock by Davis, its a good lock, good enough and serviceable.
Larry Zornes also makes a lock that can be used on the TOW stocks with just deepening the lock mortise slightly.
Overall its nice kit build. Lots of people don’t like the Northwest Trade Gun because it looks cheap, historically it was intended on looking cheap. Some things can be made to make it look nice like, using butt plate screws instead of nails and slightly inletting the trigger guard. You could also add a nose cap and entry pipe to make it more Fowler like.