I want add, the saving grace about Comet rubber powered kit designs is that most of them were lightly framed making them lightweight, which helped them to fly better than the then heavier "lumberyard" Guillow kits. The Guillow kits when built were better off as display models.

Nowadays, a few have built Guillows from plans using very lightweight balsa, which then they become decent flyers. The kit wood back then was rock hard and heavy, almost like pine wood. But even so, the kits then were very affordable especially for an adolescent.