CapnCrunch
Friend of Leo's
If you bought one of those 1950s Finishes Necks + the Lollar pickups + the appropriate electronics you're at $500 before you get the body, pickguard, bridge, etc...
Seems like you can do it, but the whole point of the Nash is you can go in the store and verify it's all perfect already.
If I buy a $200 neck off Reverb I'm just taking it on faith it's got a great fret level/crown/setup on it. I don't have the tools & skills to make it as good as a Nash or Fender CS neck if it's not that great out of the box.
I don't think they are overpriced compared to Fenders. Except for that every Nash I've ever seen was Reliced and I don't want that and/or wouldn't pay extra for it. The Nash guitars I've seen in person were priced in between what an American Pro Tele and an American Original/Ultra/Elite would cost. I don't really think the Nash ones are any worse or better other than you're stuck getting a relic finish.
Add to this analysis that you can sell your Nash for over $1,000 used (probably). Your no name partscaster……...not so much.
I got really into scratch building, and I am at a place where I can scratch build a guitar that easily compares with the best custom shop guitars you can buy. I can't sell them for what I have in cost of the high end parts, and that's before I figure in some cost for my labor. I still dabble for fun, but it is a costly hobby. If you're not building high end arch tops, it's a tough business to be in, and you can't make it without taking advantage of economy of scale.