Plane eventually found a proper owner who restored it to flying condition.The Marvel research plane from August "Gus" Raspet at the University of Mississippi in the mid-1960's should be mentioned, but I don't know whether it had a fully composite primary structure (initially it was built "around" an Anderson-Greenwood AG-14 but grew to be very different).
The AG-14's (all 5 of them) were totally aluminum construction. I owned #2 which had previously belonged to Uof M. They built a different set of wings to explore boundary layer control by using a zillion tubes fitted to the underside of the top skin, attempting to futher lower the pressure on top of the wing. Those were also alum. They DID scab on a bunch of glass panels to the nose for cg requirements but I removed it and hauled to dump.
Side note: C G Taylor did the test flights on Serial #5 when the engine was upgraded to 0-200.