Ok, I have a superfluous psychoballistics hinge frame from my PB superbolt that I am modding to fit on my automag classic.

I have already measured out the hole I need to drill for the twist-lock retainer thingy, but of course I have to wait a couple weeks to get to my drill press. I figured I would also have to open up the inside of the frame more.

Is there anything I am missing? This seems pretty straightforward. Any hints or suggestions? What should be the hardest part about this?

You probably have to widen the slot for the sear

And make sure there is enough room behind the trigger for the sear rod to hit the trigger