Doom3world

I am very new to Doom 3 mapping -- I have just started reading tutorials for basic mapping and texturing techniques. And, though I have searched this forum as well as google for answers to the questions, I was not able to find the information I was looking for. So I apologize for the simplicity of these questions.

Right now I have a large collection of material files and textures from a source mod I would like to use on my Doom 3 map. They have already been converted to tga and I understand the basic structure of the doom 3 material shader to begin porting the ones from the mod. However, I have read how to create custom cubemaps and linking them together manually, but is it possible to do it in a similar way to source maps, i.e. have a cubemap enitity in the map and tell the material to use the nearest entity? Also, what are some standard mapping practices like general room height and door dimensions, and the number of stairs per level?

Here is the code from the Source mod material file I would like to port (more information about source cubemaps here: http://developer.valvesoftware.com/wiki/Cubemaps):

I don't know how source handles cube maps. You may need to do a bit of image editing and file renaming to make it work in Doom 3. Details are as follows...

http://www.modwiki.net/wiki/Cube_maps
http://www.modwiki.net/wiki/CubeMap_%28 ... keyword%29

Assuming Source still uses the Quake 1 conventions, id hasn't really deviated from this since then. Doors, characters, etc. are all about the same height, speeds have changed though. For doors, check out the door models in Doom 3. The door frames/doors are models, no brushes. Player height is ~ that (64 units?).
http://www.katsbits.com/tools/

Check out the reference object files. Those are all basic sizes. I think you can walk up 16 height units. I forget the jump height, might be 32. That's actually in a .def file in one of the pak files (they're just zip files).