I'm not going to lie I've been hesitant to do some of the metal work, specifically working on the hinged trigger guard conversion and latch. I've never done one and I want to do it well. But it was time to do it. I started with the floor plate. I ended up drilling the exiting hole for the release larger, then turned a piece of steel rod to make a press fit plug.
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Then filing and sanding it down. Having a plug allowed me to drill a new hole the size I wanted. In my case since I was making a swivel latch it allowed me a little more room to fit the locking tab. The other thing the plug did was leave a relatively flat base under the lever instead of the lever overhanging the bevel on the back of the floor plate.
[Linked Image from i.imgur.com]
and after sanding:
[Linked Image from i.imgur.com]

I relocated the through hole in the floor plate, I made it .180" diameter. Then I made a lever with a one piece stud to go through the floorplate. And then I turned a 'tab' that would fit on the stud, sanded 2 flats on the side and pinned it to the stud with a 1/16" roll pin. The tab is a pretty close fit and was pressed tightly before pinning. I'm hoping the friction of the fit will keep it in place.
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]