As someone who tried (and failed) to adapt to other ergonomic keyboards (like a Microsoft Sculpt a few years ago), this really speaks to me.
The interesting thing is I did manage to fix most of my right wrist pain, but not through an ergo keyboard – switching to an Apple magic trackpad did the trick.
But I'm still intrigued by your design - if it was something I could buy (instead of building) I would give it a go.