This seems a very useful tool to check out.

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Speil

Moment of Inspiration
3D Modeling for Designers and Artists.
Powerful, accurate, yet easy to use!
MoI’s sleek intuitive UI blends a fluid easy workflow with powerful tools, making it the perfect choice for someone who has been frustrated with the complexity of existing CAD tools.

MoI is also a fantastic complementary tool for a polygon-based artist since its CAD toolset and advanced boolean functions enable extremely rapid creation of mechanical or man-made type “hard surface” models. The icing on the cake is MoI’s unique polygon mesh export that generates exceptionally clean and crisp N-Gon polygon meshes from CAD NURBS models.

MoI version 1.0 is not quite finished yet, but it is very close. MoI is currently still in open beta release. If you're looking for a fresh, fluid way to draw and create CAD-accurate 3D models, then download the beta and give it a try! Also, please drop by the discussion forum to give any feedback.