Could be a Tower Trainer 40 kit. or a recovered ARF. Or could be a recovered Hobbico SuperStar.

The Goldberg Eagles have windows in the font and sides under the wing where the rest have solid ply. The front would be difficult to convert to wood because the wing sits on top of the window plastic. But the sides could have been just covered over and not installed. The wing leading edge would also be difficult to sheet as the leading edge on them were dowel rods.