People are bad about drawing grind lines that don't make any geometric sense. They don't have a head for geometry. A common error is a grind line that goes directly to the tip, which would create a point like a screwdriver on the end. I keep seeing people draw things like this.
Pat,
I'm the one who said that CAD is generally a lousy tool to design a knife in. Most CAD programs you guys are going to play with want to draw true arcs. If you look at something with a nice flowing shape, there aren't going to be many true arcs on it. It might have a sweeping line that at one end has a 100"R, a 50R in the middle and a 1" R at the other end, with every other radius in between those in an infinitely varying arc. Look at a French curve for an example of what I'm getting at.
Practically all aesthetic products are designed with non-linear geometry. Cars, consumer products, everything. Artists draw this way, and high end design programs generate this kind of geometry with different types of spline geometry. Parabolas and conics would be simple examples.
If you're going to go to the effort of making a hand built custom knife, the shape should be important to you. If you hope to avoid a clunky shape you should avoid letting the CAD system "drive". This is a common problem that I see a lot.
I would suggest doing your knife design in a drawing program like adobe illustrator or similar that supports smooth clean curves.
For what it is worth, I use CAD a lot. I use it do design plastic parts for injection molding and I do quite a bit of it. Examples:
http://s566.photobucket.com/albums/ss107/Nathan_the_Machinist/product_designs/
These are not highly stylized consumer products, and even they don't use many straight lines and true arcs like someone just piddling with CAD is prone to do.
...my .02...