Problem with Mojoworld would be trying to find a good space to place your props and scene: because it's a fractal world generator, it van be difficult to get a more urban/manufactured look on it. Trying to find that ideal site for a city or airfield might prove tricky. I got a copy of worldBuilder on my latest issue of 3D World a few weeks back... not had a chance to play with it properly yet, but it might be the way to go... no creation of complete planets, but a good way to get a larger-scale vista with more control over height variation, perhaps... jonthecelt