Welcome to the 'chiefy dungeon' and in fact welcome back to the 1987 "DungeonMaster".
It's all here, DM, CSB and a legendary level editor that is SO slick to use! My thanks goes out to George Gilbert for making it all possible.
When you find coded scrolls in the dungeon, you will need to use the 'DM table.exe' program.
The guide contains major spoilers for this dungeon. Use it only if you really need to!