Probably not... We make our own designs in a way that we think it should be. We use them to make one or two cars at the most and there is no commercial intention behind it in any way.
If I (or Kees) was to sell the CAD-plans it would be wise to put some sort of patent on them but that is not cheap. I personally will never put my plans on the web just like that. That would be our luck, putting our plans on the web and then some company takes it (because there is no patent) and then all of the sudden you see your own design somewhere in a kit. I personally don't want to take that risk so my plans stay where they are.
My suggestion would be, get yourself into AutoCAD and start being creative. That's how we did it.