PointCab and Trimble (former Google) SketchUp work perfectly together via the Collada interface. For that purpose, you have to activate the creation of Collada (*.dae) files in PointCab. The tutorial shows how it works: http://www.pointcab-software.com/en/tutorials/cad-tutorials/sketchup-tutorials/
With PointCab, you can edit layouts, sections, height points, meshes or terrain models of your point cloud in SketchUp. Find a short tutorial here: http://www.youtube.com/watch?v=4tSPfk0iujI&list=PL38F9E47635F9E7F3&index=18
