Grond posted this, in this thread, back in 2002.
In any case, according to Wayne Hammond,
Tolkien ultimately approved the explanation (for
publication) about the
towers that appears in
The Fellowship of the Ring. Tolkien also submitted his final design for the cover of The Two Towers (see
J.R.R. Tolkien: Artist & Illustrator. London: HarperCollins; Boston: Houghton Mifflin, 1995 by Wayne G. Hammond & Christina Scull). This drawing has now also been published as a cover for The Two Towers and depicts the same two towers as described in The Fellowship.
Galin