The Smoothie in its iterations is one of those perplexing airplanes. The version published in the magazine was different than the one that went into the kit: airfoil, wing area even the span. John Miller posted that he did the plans/laser files for the Brodak kit, and that he worked directly from pencil drawings supplied by Bob Palmer of his original Smoothie. The plan supplied by Palmer to Miller for the Brodak version differs from the published or the Veco kitted version. It has a better airfoil, more like a T-bird instead of that laminar flow edition that went into the magazine and the kit, and it has 540 squares, which is larger than the Veco or (I think) the published version. As noted, John Miller also did and addendum to the plans for the inverted engine configuration like the Veco kit. Personally I think that is the best looking.
So which is correct? ALL of them.
I have flown the Brodak and it flies well. I watched Phil Spilman's Smoothie built from the magazine plans (first one I ever saw) and it also flies well. Way back in the early 1960's my brother built one from the Veco kit, flew it maybe 3-4 times before he sold it...