Yes it's cool for a fan of Blender! :)

But no so friendly (also in Free) than Sketchup or PCon Planner! :)
Sketchup Make
http://www.sketchup.com/download?sketchup=make
existing on line! : http://www.sketchup.com/products/my-sketchup



Pcon Planner
http://pcon-planner.com

Moi Object imported in Sat Format!

The incredible thing is that you can directly import any web catatlog of world companies from the PCon catalog!