Outstanding, looks like the BRP stampings are the only way to go, at this point and time, for the real look.
“… corporations have been enthroned, and an era of corruption in high places will follow, … until all wealth is aggregated in a few hands and the Republic is destroyed.”
Nice looking receiver Tink. Before you get too much further along, might I offer a suggestion? My BRP stampings turned into a display long ago. Mill out the charge handle slots right now. The BRP stampings have radii that are much too large. The c/h has to nest in the bottom right as low as possible. The large radius precludes that. I had to machine away much of it, and narrow/bevel the c/h to get it in there. The rails also nest into the corners. See the cut-away photo of an original. Comparer radii in your photo #2, at the joint. The radii must match at the lower right. BRP uses sheet metal that is much thicker than the originals, and the contours are not correct. When you have a mechanism that has tightly fitting parts inside and out, like an MG42 receiver, that can be a dis-advantage. So before you weld up your receiver parts permanently, be sure the rails, recoup and c/h will fit. It's a tight space. I've only done original receivers since, with few problems. Great watching your progress. Good luck...Phil