Soooo back at it today, looking to pass that crank test. I decided to go back to basics, and begin by verifying all my grounds. First order business, however, was to make sure that the engine fuse box and the front body control module were all hooked up correctly.
I spent some time making sure the engine fuse box was fully mated to the multi-plugs. I had made the screws just a little more than finger tight in the past, this time I really cranked them down. I also verified that the plugs that connect the body control module to the rest of the vehicle were fully seated and clamped down. Next, I went to every single relay and fuse in the fuse box and on the body control module and made sure everything was fully seated. A couple of them move down a tiny bit which makes me wonder if they weren't fully engaged.
I was very surprised after doing that, that the full dashboard appeared to come up, meaning that all the idiot lights that previously were not illuminated came on.
With the dashboard alive, I pressed in the clutch pedal to flip the clutch safety switch, and turned the key. The fuel pump tried to prime, and the engine turned over!
I tried the test again to see if it was repeatable, and it tried to crank again in the battery immediately died. That's no surprise, it's on the charger now. So I can repeat the test again I believe the next step is to put some fuel in the tank, verify no fuel system leaks, and try to start it.
Holy **** I'm stoked! I am sure I'll have a lot more questions, but just wanted to say I'm grateful to everybody who has answered all of my questions so far. I'm far from done, but this is really exciting.