Now THAT was a long time ago. I remember as a kid drooling over this design and I'm still scratching my head as to how I came about the plans. My research does concur with your MRN comment. They skipped over plan #55 from Vol 8 #1 to Vol 8 #2, but there is reference to it. Vol 8 #1 shows a concept drawing on the cover, although it's not exactly the same design. Similar, but not. There's also some info in "Notes From The Boss" which seem to discuss this design. Lastly, at the bottom of the page, there is a big red boxed note stating the plans were available through some "clip-n-mail" page, which isn't in the document.
See MRN VOL 8 HERE
I'm left here wondering if I did mail that request in for the free plan or if the hobby store just had them laying around. Back then, you could get anything you wanted at Science Hobbies. (no longer in business). Anyway, I did acquire them and build it sometime in the early 70's. Later on when I became a RE-BAR, I discovered JimZ's site and printed off a replacement copy. Never built it though. Until a few years back when the notion hit me to rebuild it but as an upscale model. That was fun! I turned the nose cone and the longer pod cones on a lathe and made myself a BT 70 version of that dreamy design. And since I didn't know where to have decals made (at that time) I opted to have them cut in vinyl. Oddly enough, I never saw a good pic of what that image was on the fin. It wasn't until way after I built it, that quite a few folks chimed in on my build thread, and there were 2 people that used the Excalibur sword for said fin image. Both were different. Apparently no one really has, or had the original since it wasn't included in the plans. So I made my own design. Here's that build thread if you are interested.
I'd be very interested in knowing why this design has no designer name and why it only became the concept drawing for a cover page on MRN.