That is a superb tutorial, Clint. I am looking forward to the rest of the series.
I have a three-hour video on forging an English-style lock that I picked up at the Cumberland Show a couple years back - I'm blanking on the name of the smith - that has a slightly different method of forging a lockplate with an integral pan, if my memory serves me correctly. I believe he just started out with a very thick piece of iron and thinned it out, with no welding for either the pan or the bolster. I think your way is a little more manageable.