I feel the first step is to get the core components working: that means the Orange Pi, the keyboard and its associated microprocessor, and the display breadboarded and functional. To this end, I ordered the necessary components to begin. One problem I already see is the keyboard connector: it's surface mount only, and I can't find a breakout board for that style of connector. I may need to design and order my first custom boards for this application. I'm going to spend a few days looking around the internet before I commit to that course of action.