Bexrbetter,
It'll be fascinating to watch this thing take shape.
I am curious, though--and perhaps you've looked at it already and have sound reasons--but why not make it a 2-stroke, using one of those electric/hybrid turbos (or whatever they're called) for external scavenging and, perhaps, direct injection for good efficiency? Looks like you could knock the parts count way down that way and save a few pounds as well.
Please keep us posted on developments.
Pog