My solution where I had rooms/passageways butting up against each other was to assign a thickness to the walls (think I used 6 inches) and convert that to a number of pixels at the appropriate scale of things. Probably should have gone a bit thicker. But my working file is set at 36 pixels per foot, so each I ch is 3 pixels (inside the map, that is). You guys could probably do something similar that would affect the shape/dimensions of the various rooms only marginally.