At first use Revit, then try…
You might have seen Dan Jürgens and Zac Arato’s post on www.nzdan.com?
They recently discussed this topic – “Visualise Revit conceptual designs fast with 3ds Max, mental ray and V-Ray” at the Revit Technology Conference in Sydney.
Image: Dan Jurgens & Zac Arato as on www.nzdan.com
Find more about them by reading this tutorial they’ve set up. It uses a real life project to demonstrate the use of Revit for concept designs and then the process of furthering your renders in 3D Max, using V-ray and Mental Ray.
I suppose the same principals could apply if you’re using Sketchup.