Hey,
Keep pushing, there's not secret at making maps!
We don't use DEdit as pre-rendered prefabs software (much like the UDK or even the latest version of talon, Jupiter Extended works that way) but apparently it was "supposed" to be that way.
If you take a look at the files installed during the SDK, there are crucial files that work with a certain version of Lightwave.
It was possible to go back and fourth Lightwave with both Model Edit and DEdit to make models and maps without having to do a single brush inside DEdit or apply a single texture (the only things you had to do was to add objects).
So if there's a way to export to Hammer, I'd bet it would be the way : DEdit > Lightwave > Export to some sort of friendly format like .obj > Hammer.
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Concerning the map, I've been busy lately, lots of work to do and it all happened at once, I've to organize my agenda.
I did some progress but not incredible one, you'll have to wait for more picture which I promise will come out!
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PS: If I ever got the time, I'll try to make a video tutorial for DEdit, something around June.