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The way my hand falls on the keyboard I think the thumb space under the keys works best for me.
That makes sense. If your thumb naturally falls there, you might even be able to make the thumb keys 1u or 1.25u and put a 1u adjacent to them (left of the left one and right of the right one). That way your thumb would only have to move a bit laterally and you get two extra keys with no wrist movement.
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The way my hand falls on the keyboard I think the thumb space under the keys works best for me.
This is really appealing to me. My biggest issue with the ErgoDox was the vertical thumb buttons didn't account for the variances in where I hit the space bar (I need at least a 2x wide space bar otherwise I'm using extra muscles in my right hand that introduces pain).
I'd love to see this turn into a full fledged board, and would probably end up buying one.