I received PCBs today and built the first prototype.  Everything went pretty well, except one slight issue that was easily fixed.  I hadn't thought through one part of the power control circuitry.  In an attempt to clamp a 5v "power on" signal to 3.3v for the Teensy, I did not consider the minimum logic level for the boost converter's enable pin.  So the circuit was not turning on.  A little simulation and rerouting one node of the circuit with a wire fixed the problem.  This could be easily fixed in the first revision of the PCB.  I'm using a smaller TFT touch screen that I had on the breadboard.  Consequently, I think my touch screen values calibration is way off and needs to be redone.  I'm very happy with the way all of the components look together.