I looked through the outerzone gliders yesterday and saw some similar planes, but nothing extremely similar. Still a good place to find something worth building, as I've already built one plane from there and probably more. Maybe you can find something interesting there.
The plans for this plane just don't seem to show up anywhere. I'm guessing this plane may be like a number of kits, where they only released assembly plans, versus part detail plans. Companies think that it would keep them from being copied, where in reality it hurt the modeler. Any crash damage, and you couldn't repair the plane from the plans, as there were few or no parts detailed on it.
The Astro version definitely goes a way back. I had one of those heavy Astro cobalt motors that I gave away in a Herr Cherokee. Today folks would cringe with the thought of using a cobalt motor and NiCd cells in a glider.