How would I go about configuring Shadow Warrior to make my own maps? I understand Blood, but Shadow Warrior seems a little different. I don't want to have to mount in dosbox every time. Any help would be appreciated. Thank you.

Romans 10:13 "For whosoever shall call upon the name of the Lord shall be saved."

I don't have the game installed at the moment and I'm on a Mac right now, but there ought to be a shortcut for the map editor in the game's Start menu folder. The game's installation folder should also have some documentation on using the editor. I haven't used the editor since the game originally launched in, what was it, 1997? I used the Duke Nukem 3D editor extensively but found the SW editor somehow more difficult to use by the time it came out.
http://swcentral.weebly.com/build-editor-information.html
This site has some specific information on creating things like vehicles and rooms over rooms. I wish I had something like this back in the day.
Sorry I couldn't be of more help! Hopefully someone else can elaborate.