I am embarrassed to say that I forget his name (Cashmore?), but he suggested in an article that he had them. He responded to a thread here at the time and said that he did not have them. As I recall he said that as late as the 1960's someone told him they had the plans. But but I don't recall the specifics of who that was nor whether Cashmore (?) had actually laid eyes on the plans. My sense was that there was a bit of careless writing involved. Perhaps other will remember events more clearly.
Bob