Real nice job.
I'm sure others disagree but, no need to crown the bore with a flashhider/brake. The main purpose of a crown is to protect the rifling if the end gets bumped.
There's a good article posted on this very subject. I'll try to find it and post a link.
edit,,,, Here is one of the threads. follow the link in the first post.
There's another one where they actually cut the barrel at different lengths with a hacksaw , not even squaring the end, and shooting with no discernable difference in accuracy. It might be on another forum. I'll try to find it later..
BTW,,, I've cut quite a few surplus rifle barrels, leaving the crown square to sit flat on the face of the brake/flash hider. I've found that different styles of brake affect accuracy far more then the crown angle.