The expression "high-built organ," probably alludes to the organ being here, as in some cathedrals, reared above the screen which separates the choir from the nave.
"A Key to Lord Tennyson's 'In Memoriam'"
Alfred Gatty
See how high above the world we are already, and still the gallery over the nave is much higher.
"The Dead Lake and Other Tales"
Paul Heyse
The voice rolled on: I am an old man now and only twice before in my time nave I seen that spirit in a young man's eyes.
"Fortitude"
Hugh Walpole