I am going to redo the PCB to reduce its size and fix some of the original errors. Size reduction will mean I won't expose as many of the IO pins from the micro but as a board to host a sensor that shouldn't matter.
I will also be making a variation of the board to power a raspberry pi instead of the microchip pic, and that board will have a class D amp as well as a couple of sensors. I have a working design from an older project (using the TPA3116 TI class D amp) that will be reused.
In the meantime, do post any questions.