For one, the stock.
Yes, but, you will have to google "stock makers"
Anything is possible. I would suggest that instead of converting your existing stock, you buy a thumbhole stock. I think you will find that the cost of conversion and cost of a new stock not that far apart.
The current catalog does not show one. You can get an aftermarked one.
With an Extra Full choke, 60-70 yds. How well THAT gun patterns and the load used has more effect than the shape of the stock.
I have a new one in stock at Knight's Ace Hardware in Cedartown Ga. Call 770-748-2742
gunparts.com has them
cowbourd
Brownell's, gun show, on line acution.
There were a few black knights in history. However the character of a black knight is a stock character that usually is in the story to fight against the white knight.
At Gunstocks Inc.
It depends on the condition, the market (area) and a lot of other factors. The best thing to do is go to www.gunbroker.com and www.auctionarms.com and look at what comperable weapons are selling for. Look for the "buy this now" button and look at those prices. If I had to price it without knowing condition, I would assume it is god and say approximately $200. Hope this helps.