That helped, thanks. I went hotfoot to the bookshelf and pulled out the 1959 volume. It was an article on fitting radio to the model. That gave me a latest date to look back from and I finally after browsing non-related articles (told you I got sidetracked) in the January 1956 issue. Unfortunately, because of a postal hiccup, the plan wasn't illustrated and it was only a two page article on model construction. Looks like I'll have to buy the plan now, and add another one to the dream list.
ps, I checked out the Magazine Exchange site, and a lot of the early years issues have no list of contents. Perhaps when I have time!!