Just joined the forum, and working my way through this thread. Wow, amazing.
The next problem I had was getting a hex tool onto the bolts at the front of the diff, there is not much space there. I ended up fabricating my own tool by simply cutting a small piece off my hex tool and then plug welding it onto some flat bar.
Plus, you're making your own tools - impressive. I was jealous after seeing your build, but even more so now - the rest of us have to buy these things (Anex slim offset hex key):