Awesome work Rob!
Interesting, my front diff mount that I made 3 or so years ago is similar to the grey part in your picture. Except it isn't tied in to the rear. I haven't seen Mr. Tyler's mount but am interested.
Mine has two plates going back instead of the tubes you have, and they have horizontally mounted fins with holes in them which line up to the diff mount holes. It kinda looks like a fighter jet But basically, it's just suspended there, no mounting from underneath so the bracing to the rear would help a lot.
What are you doing for the front of the control arms? Are you using the stock x-member? I did away with that by cutting it and leaving just the "saddles". But I was told that without some bracing, the diff will want to nose dive despite the beefy steel I used in mounting it up top.
Owen