I assume you are using povray or similar to render your sky sphere? Perhaps try making the sphere larger and having the light inside. Also ensure you flip normals on the sphere so that it's visible from the inside.
Terragen probably supports a file format that you can load into AC3D - but I don't know much about Terragen.
For mirroring an object use Object-Mirror - that does all the hard work for you.
For the boolean plugin to work weel, you must use 3D objects and ensure they are closed (no holes) and have all surfaces facing outwards. See the text in Help->about plugins.
You may need to edit the specular(?) values in 3DS in order to see the colors - a bug in AC3D's exporter.
Hope this helps,
Andy
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