A little update: I developed a simple but effective method to create some of my dungeons and levels, the "ground/platform" in the screenshot took less than 60 seconds to create (in MED).
(click to enlarge)
The levels will be a combination of these "terrains", models and simple block-geometry, the background will be multilayer sidescrolling 2D graphics in in-door levels and 2.0-2.5D in out-door levels. It's not a continuous style but I think it will work out quite nicely.
Early background-system: Video (Sorry for bad quality, it's really dark, too)
What do you guys think? How many background layers are good/ too many?
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual