Great thread. After some deliberation, I've concluded that it must be bought.
But just to play devil's advocate here...
There are four major problems with this gun: Bubbaed, incomplete, mismatching, poor condition. I can see how a "collectors' piece" could be forgiven of one of those problems in the name of capturing a rarity, but not all four. This is neither collectors' piece nor shooter, and with those problems I feel it contributes little to historical interest beyond serial studies.
I know that if I bought this gun, which I definitely would for the money involved, it would not stay with me for long, but that's just the way I am. Correct and matching are what do it for me. And dumping money to make an already incorrect gun complete is not fulfilling to me. I've tried. There are too many problems here. Too many excuses.
With all that said, I still think it must be owned. I've never even touched an NK and would be thrilled with the opportunity to own one, no matter how fleeting I knew the thrill would be.