putting it simply ...
You can draw things in Sketch Up that you can not make on traditional equipment.... maybe on a 5 axis mill, I donno? If you are going to make these things, you have to use the skills and equipment on hand or at least within a budget. They can not be so complex that that are beyond the scope of your skills or your $$$.
I don't see these shapes being cut with traditional woodworking machines, but I could be proven wrong. :frown2:
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)