Making the stairs in Blackmoor Dungeon line up?

[Havard]

I've started using the image program GIMP to superimpose the levels. Ultimately I'll do a schematic of the corridors and staircases - with enough detail to understand their interconnections, but not enough to replace the commercially available maps - but (as I also posted at the OD&D boards) so far the project isn't ready to leave the underdark.

Even from the first three levels that I've figured out, it's clear that this is the most spatially complex megadungeon I've ever seen; the subareas in Caverns of Thracia often span multiple levels, but each is limited in extent and usually have simply two or three entrances and exits. The levels in Blackmoor are large, massively interconnected, and broken by the cave-ins into small subregions that you often have to go up, then down, then across etc. to enter.

Maybe you will have to add more levels in between the existing ones?

Havard