I dont have any way to address the alignment
, no shops near by, dont have the luxury of having oskar near by or steve around anymore i dont really wanna sell, unless i found a flintlock 45 long rifle
Or a flint 45 cal hawken/plains type gun. I still have the 50cal thompson steve and i built, have a lyman 50cal hawken, a 58 cal zoli Mississippi rifle and a David Dolliver trade gun built in 1998. Signed. Id like a smaller bore gun
I would have to agree with Wayne on the nipple, it does look like it may not be threaded all the way in, if not that would help a little with the alignment. You would still need a bit of a bend on the hammer. (you should be able to do that pretty easy with a propane torch. (MAPP or Oxy/Acetylene would be easier)
The other thing you can do is use a centre cutting end mill to cut the inside face of the hammer to the right angle.
Double check the twist on that barrel? If it was a custom order - being that short, it might have a faster twist for bullets. (as opposed to round ball - Rice will do a custom twist)
Seen all those parts before -- it's either Petatonica River or Track kit parts ... the entry pipe will be the same on both. just grab the part and cut/file to the inlet you have. Probably a much easier job than inletting a new thimble
Nice wood!
As to value? Well, getting the parts up here is going to be $1100ish CDN if you get hit with duty, add another couple hundred. Then either paying someone or your time to build one.
I would love to tell you $2,000.00 - $2,500.00, but I can't.

That may be fair value for the person who built it, but the market up here is miserable.
I would hope break even on your trade is at least $800.00, I don't think I would take less than $1,000.00. so $1,000.00 - $1,500.00 on the high end. Lean more towards the high end if that barrel has a fast twist & hope you find the right guy on the right day.