Regarding the so-called CD models, for what its worth, lets get the record straight.
That is Cleveland Model & Supply,
not known as "CD" in any of my dealings with them. Cleveland were very famous as the supplier of plans and components to the model aircraft world, way moreso than trains. They are still in business, and have been since 1919 which might make them one of the oldest model concerns in the country.
I still have several aircraft made from their plans, including this C47, that a very good friend of mine and I built together 'way back.
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This A26 was completed to their plans...
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as was the Vultee Vengeance.
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They all built up like the C47, then were covered in thin birch. The C47 has a four-foot wingspan. Unfortunately, my modelling partner contracted leukemia before we finished the C47, so it remains as it was when he could no longer work on it.
All in all we built at least ten airplanes in this manner in two different scales. He was an excellent modeller and we had a lot of fun with aircraft, both in model and in full-sized form.
Back to wood forms, then.