I remember seeing 747 and F-4 Phantom kits which had blocks of wood for the main components and metal detail parts. IIRC the profiles were pre-cut, but they included cardstock templates to DIY the final contours. The box art for the kits had the models in finished wood and polished metal.
Well beyond my skillset in 4th grade! Probably beyond most consumers today too.
Model airplanes were an almost universal hobby by boys during and for quite a few years after the war.