In the process or editing roads on the surface map to set each section of road to the right tile (east-west, corner pieces, t-intersections, etc.) I found that the editor needed some updates to accommodate the tile system.

I’ve released version 0.57 of the editor today, with map terrain editing (not useful for regular zone editors), faster room grid drawing, and better coloration for the room grid. The download link is on the right sidebar.

Road editing is about 1/3 done so far and won’t be uploaded to the server until it’s done.