So, everything is assembled and hooked up correctly. Ran some self tests to start calibrating, and there's something up with the Y axis motor. Gotta do some more testing and check the cables and swap out the motor from the old one to confirm, but could be possible they sent me a bad motor.
At this point it's a big pain in the butt, and I'm ready for it to be built and done. It's part of what I signed up for though and really love the "craftsmanship" (if there's the right word) of building something like this myself. Once I get the kinks worked out it'll be a beautiful machine that just "works", but good things take time and all that.