To second Nuttas posts there are two completely seperate feilds of CAD.
CAD/CAM - Computer Aided Design, which normally is closely connected to programs like 3D Studio Max and is more product design.
and
CAD - Computer Aided Drafting, which is what I do, producing drawings that are effectively blueprints and plans.
If you guys decide to go with a flashy 3D image then Nuttas the guy, if your looking for a clear, crisp and accurate plan... Then I'm your (wo)man!
-Carma (The Bocking Rocker)