The single very long & comprehensive interview with FJ that I have read, which was in ENTERPRISE INCIDENTS magazine, indicates everything he did that wasn't whole cloth invention derived from hours and hour and hours of studying film clips ... I don't think he mentions the drawing in TMOST at all (and I thought years back that everybody had declared the line drawings in that book as invalid, though I can't point to anything other than memory.)
Well, it's obvious from inspection that FJ gobbled up TMOST as a research source, including photos, drawings, and text. Just to cite one example, the bottom of FJ's secondary hull shows the curve of MJ's drawings, which is not present on the 11-footer. FJ didn't trace MJ's diagrams, but it's beyond question that he looked at them.