All your pictures keep locking my 'puter up.

OK, you appear to have the frame inserts very well done. It's very important to use the flat on the frame thread boss to resist turning forces.

That said, the frame in that section is very, very thin. It's very easy to crack the frame boss while torquing the barrel. Clean the original barrel & frame threads up until you can screw that barrel into frame contact by hand. Whatever rotational difference between hand tight to frame and front sight straight up is your proper barrel torque. Use that measurement on your new barrel. It's not gonna be much on a J frame.

Looks like you did a very good job.