Hi CHuck,
The Omega was the sister ship to the Atlanta, also kitted by Zigsaw. I believe the Omega was designed for side exhaust, but (obviously) could easily be modified to rear exhaust. I've seen one fly (a couple of decades ago...) and the owner loved it. I think the Omega was reviewd in RCM in the late '80s.
I wonder what ever happened to Zigsaw? The Atlanta, the Omega, then ... gone.
-Will