dll, I'm interested in organ interiors in general. This is a special organ, because it is C-C's first and it's large. Usually, a builder's Opus 1 is small, or even medium-sized. I like looking at details of pipe construction.
Thierry, I looked at a stoplist in a CD booklet and it said that the Grande Orgue 32' Montre went down to only tenor-C (16-foot C). I just noticed this and was asking myself, "Okay, so does this mean that the longest facade pipe is not 32'?" All along, I believed that this stop covered the whole compass.
Some buildings, in which organs are housed, are so large, that it makes an organ appear smaller than it really is. I've never been to St. Denis, so photos are the only things I've been going on. Perhaps this was a misprint in the stoplist (I hope).