Some things look good, some are bad. I dont like the lower part of the tsuka. The upper part is perfect. The seppa looks lower quality. As Bruce notice the over stamp of the fuchi is curious. Overall i think the sword is legit.
Did you sent him a copy??
Please refer from selling self making copies. The book is availabe for a reasonable price like any other older books. People pay a lot of money to get it.
Sori is a process of hardning.
A blade hardned in water gets more sori than in oil.
It also depends on the layer construction of the blade.
I think your sword has a sori of 0,9 cm which is in the normal range.