A conversation popped up asking if I knew about the Jupiter Ace. It in fact is one of the primary influencers behind the original Kestrel-2 design (the one with the S16X4A CPU).
But, I have many influences on the Kestrel's overall design. Here's several: http://kestrelcomputer.github.io/kestrel/2013/11/19/of-shoulders-and-giants