Nice effort, but again make sure it's looked over by someone in the know before you shoot it. You seem to have done quite a bit of filing.
Those were serious pits and as most semi owners know, a compromised slide should never be fired.
The small frame cracks around slide stops common to some Colts that were dealt with by cutting them out
are not in the same league as a small crack or weak metal spot on a slide. A recoiling slide takes the brunt of the cycle.