I have now included my extensions for SketchUp on my website.  I refer to my extensions as Instant Scripts  -- Instant roof, Instant Wall, Instant Road, Instant Door & Window, Instant Fence & Instant Site Grader.  A couple more are still in development and will be added soon. While I really enjoyed my cadmonkey days using Autocad and writing lisps on the fly, I have much more fun modeling and writing scripts in SketchUp. 

But there is still a place in architecture for 2d.  We are 2-dimensional creatures. We move about in a horizontal plane, then relocate to another plane via a stair or elevator. And builders continue to layout buildings in 2d. So for architectural tools, my vote is: SketchUp plus 2d cad.

On the SketchUp Scripts page you will find several extensions. Read - Instant Roof Plugin reviewed by Google (Nov. 2010).  Extensions are for SketchUp Make or Pro versions 8, 2013, 2014, 2015 and 2016, Mac or PC.  I hope you will find them useful.