This is the sort of keyboard layout I’ve been wanting so badly. I’m glad someone has had the courage to experiment on this front.
I want to give my thumbs and pinkies a bit more responsibility so I’d be aiming to integrate onto the FWL16 and either removing the trackpad entirely, or more likely surrounding it with keys either side, assuming I ever reach this point, and it’s possible to have input modules larger than large. 
Excellent work so far, and thank you for sharing. I hope I may get to see it to it’s finale!