IMO, it's a gamble. I would want to talk to someone at TOTW to get some feedback on the amount of work which has been actually done and how good the quality of it was.
It is possible that the person who was building the gun removed excess wood or made some false cuts and did some irreparable damage to the parts. If anything like that occured, I would pass on it.
I would rather carve the stock out of a stump with my pocket knife than try to save someone elses screw ups if they are very bad.
As for things like the dovetails not existing, you can always take the barrel to a local gunsmith and he will cut them in for you.
The biggest question is, is this a gun you would want to have and be willing to put hours of your labor into? If the answer is yes, then go ahead and look into it.
If there is any hesitation about spending many many hours working on it then you should not get it.
Of course, you also need to be willing to buy the books and tools you need and don't have. Things like files, chisels, drills, taps, measuring devices like dial calipers (very handy but not indespensible)... and a place to work on your project.
Some wives don't like their kitchen table being used for filing, pounding, drilling, swearing...
Good luck to you. Let us know what you decide to do.