Here's a better picture of the Butcher's chamber (sans dead bodies) that the alpha cathedral DRLG uses. Notice the arches that surround the chamber. These integrate well with the alpha DRLG but are absent in 1.0+.
The new cathedral DRLG (used by default in the pre-release demo, also the only catehdral DRLG in 1.0+) uses levels\l1data\rnd6.dun instead.