April 3, 2020 Update: I finished the machining sketches for the Champion design and I am in the process of buying materials for the project.  Work continues on troubleshooting the Legend.  I had been loading rounds for it with copper-plated projectiles, but I found that copper powder was venting through the gas system and building up in the BCG until it wouldn't cycle correctly.  Thus, I am going to experiment with some different projectiles.  I also spent some time this week working on the final round of proofreading for the Western novel that I intend to publish.  Anyway, this weekend I plan to upload a video I made summarizing the results of my armor testing to date (or most of them; there is already one additional relevant test that I did after making the summary video, that being the 7-mag vs the AR500 plate.)