The big Tuba is horizontal.....I once tuned a couple of pipes.
So, I think, is the new reed (Bombarde?) pointing East, with much of the rest of the organ scattered at various points on the compass.
The 1993 Bombarde has on specifications/descriptions of the minster organ, sometimes misleading been described as "en chamade". Whereas what I have seen was vertical, and hooded sitting just behind the curtaining to the right of the main case above the choir stalls (viewed from the choir). As has already been pointed out, the Tuba Mirabilis has a vertical chest & boots, with the smallest pipes hooded and the rest cranked round akin to a trombone slide, so that the mouths can be seen from the nave
PL