Took me a while to get it done, but I finally knocked out a schematic for this thing. Part of why it took so long is that I spent a decent amount of time finding an online schematic maker to use on the Chromebook instead of just firing off Eagle on the computer. Then another bit of time to figure out just how to represent some of the parts... Still, a schematic of the project is finally available, and it can be found (and tweaked) via its EasyEDA project page.

(please forgive my lack of schematic skillz)