IMHO, you can either go all out on a resto (a la Doug Turnbull or some other equally talented and pricey smith) or just clean it up as is and reline the barrel. Anything in between would be unfair to a pretty special rifle. BTW, I think that hole on the tang that you indicate with a white arrow is supposed to be there on the very early rifles. That rifle does indeed look righteous to me.
As for the SST, if it letters, it would be worth your effort to return that to function using original parts if possible, since that is a VERY rare feature on that early a rifle.
Good find... enjoy it!
Froggie
