If you haven't already done so, I suggest that you download the Getting Started tutorial for KT 2007...
For materials, I recommend that you download the Kerkythea Material Editor Guide for KT2007...
Edson, what are you using to open DWG's? I, too, have had limited success with edrawings, though not as bad as you are experiencing, but I haven't found a better solution.
Really nice and impressive!
I should go into this GIS thing myself, I think.
This is very similar to what I'm doing (though that's a bit "older"):
viewtopic.php?p=19136#p19136http://www.sketchucation.com/forums/scf/viewtopic.php?f=82&t=46
Thanks for sharing!