The day has come... My smart watch prototype works! It turned out I hadn't switched some of the pin assignments in arduino from my testing rig over to the new pins, so after some more tracing, the OLED is working along with everything else on the board! Success! Now I have hardware to play with, I can work on some software and trimming down all the libraries for maximum space. I'll also make my own fonts and store them on the sd card as they take up WAY too much space in flash. I've gotten emails back from help sources about the companion app, and should have it done soon. This is shaping up to be an awesome project!