I like the shelf type baffle of that Milodon pan better than the other early CJ style of the Summit pan. I think I'll use your technique of finding where 3-4 quarts level is in the pan and place the baffle between the two levels. I think their technique of not welding the plate all the way in, but leaving a few spots open for drainback will work good and should keep the oil from pooling on the wrong side of the baffle.
Thanks for the links and photos, this is a big help. I'll post some photos of the baffle when I get it done.