Fantastic build! Quite a milestone in itself to have converted baseline Raduino functionality from an ATmega328 to a Kinetis K66 Arm M4.
It's an extreme upgrade to the 'digital' micro-controller hardware side of the uBITX, paving the way for many additional enhancements and features to be handled by the micro-controller.
I applaud the work you and W2CTX have done here.
Thank You for sharing your progress,