I had always assumed that it referred to the practice of making mock-ups or stand-ins out of cheap steel in the aerospace industry. https://afspacemuseum.org/a

I had always assumed that it referred to the practice of making mock-ups or stand-ins out of cheap steel in the aerospace industry. https://afspacemuseum.org/artifacts/apollo-boilerplate-capsule/ https://afspacemuseum.org/artifacts/apollo-boilerplate-capsu...