Got out today and found time to get the top tang heated and bent down to match my sporter stock set. Then spent more time removing a bit more metal off the thickness up near the receiver.
I've got the hammer and breechblock rough shaped and somewhat polished. I'll need to do the final polish and then use my checkering file to get the spurs checkered again. A lot of extra metal on these two spurs, so they're still a bit heavier than sporter, but polishing will remove the rest.
With the thinning of the receiver sides the pins stuck through a bit too far, so I took about .090" off the excess length.
While I was at it, I went ahead and fitted the tang sight base to ensure it was dead vertical with the tangs. Then D&T the holes to mount it. Took a little more metal off the right side to get the tang sight vertical.
A few hours of polishing and it will be ready to send back to Al springer for color case work.