This page shows you some CAD samples done with Houdini.
The original is not included, because of copyright stuff. Well I get the CAD samples from Google Image search, well if Google copy the pictures and display them, this is fine. If I did this, I got shot, so, original not included, search yourself …
Anyway, Houdini is very great to bring CAD drawing into 3D, because of procedural workflow, you’re able to always go back and correct some mistakes.