Thanks all, it's been fun and frustrating both.
Terry, thanks for the tip on the emery cloth.
So, I decided to move on from the trigger action, I'll get back to that later. I just need to keep polishing, and that's filler work, so I can do it anytime. I added the ejector, and now the slide has resistance again, so I will have to do some stoning and polishing on that ejector so the slide is smooth again. I heard some good advice, work the part to fit the receiver rather than the other way around - makes sense, I can buy a new ejector if I bone it up.
Also I began putting together some of the other components. I put the trigger in place and assembled the magazine release button (3 parts). Man, that thing sucks - you have to put about 10 pounds of pressure on it to depress it, so I'll start cutting winds off the spring until it moves better. I found this was a trick for competition shooters in order to achieve smoother mag swaps.
I also started the fire control group parts. I put the extractor, firing pin spring, firing pin and firing pin detent plate in place. When the extractor is not in place, the firing pin parts all slide in well but with the ejector in place the detent plate won't go in, so I think I need to wallow the trough in the extractor where it slides.