http://sqtwtf2gx2up4nu32cx3qthvgvn3s22vh33h4arrty5kolsiir4k5hqd.onion/~shadowm00n/adomgb/adomgb-0-15.html
The only way to reach these shops is by tunneling. Remarks about staircase generation and room layout: When hopping in the ID, I noticed that some rooms were likely to have staircases in the adjacent room. Basically, if you enter a room that's in a corner, or near a corner,
and your room has a door that leads directly up, down, left or right, into a corner, there is likely a stair room there.