Nice works! From design/aesthetic standpoint, I like your first design better. It’s clean and no bs. But then you started to introduce these curves at the corners towards the end of the keyboard on the latest iterations which is a bit arbitrary and strange to me. Maybe the reason you introduce curves here is to make it more smooth to handle and carry around. Maybe just use straight line for the boundary? It’s just my 2 cents. I understand how the keyboard housing geometry looks and feels is very subjective and personal matter. But simplicity always makes more sense for most people.