It is intended to be used for designing and ordering parts to then be fabricated by them in the USA (it works out expensive for shipping elsewhere).
But you can just draw your design and print it or export it in Autocad format (2D only) to another cad program.
I downloaded this pic from Sketchup 3D warehouse
just a sample of what can be done within sketchup.
yes other cad prgs are good but learning curve is long on most.