This project looks very interesting for the Terrain Pack - I'm currently creating new terrains for all Geoscape textures and I've already felt the need to redesign the Geoscape for better correspondence between the textures and the terrains.
However, is there any idea of when it will be possible to define use a new, modified, WORLD.DAT on the ruleset? Otherwise the modified WORLD.DAT would have to replace the original file, which I prefer not to do.