I built one in the 1969 NATS hangar at Willow Grove, between the days I flew.
In fact, I bought it at the  NATS NAVY Hobby Shop there in the hangar.
Mine was powered by a Cox Golden Bee.
A Black Widow would yield a more appealing performance.
The foam wing was a bit heavy and later....Brittle.
The wing tips were heavy plastic.
Plans were assembly type like the Sterling Ringmaster.
Much later, a neighbor was very interested in the little plane.
So we drew up ribs that matched the airfoil of the foam wing.
Flew GREAT!
If I find any remains or assembly plans, I'll post them here.
Good luck & "Tight Lines!"
Wes