I can see what you are saying about all the costs adding up real quickly and finding myself $6000 dollars into a sword that might be worth nothing. Ive been in this same situation with vintage american muscle cars. I ended up spending far more than I could have bought the same car from someone who completed the restoration and found themselves on hard times. But.... there becomes an attachment with something you take risk with and build yourself, that just cannot be purchased. I will be taking the sword to a formally trained Japanese Polisher and I will let him help me decide the fate of this project. Im not too worried about papers, as I plan on keeping the sword. I will post after the sword makes its visit to the polisher.
with respect,
chris s