SketchUp installation through the Software Center! Really awesome, the work you did!
Although the SketchUp installer is widespread on many download portals on the internet, I am not very sure how the license relates to redistribution of SketchUp (free, and Pro turns into free anyways after 8 hours). You would first have to ask someone from Google.
Even Microsoft's Powerpoint Viewer is available right inside the
Software Center (and Microsoft does not have to give tech support for it). So it could even be an nice option to have it (in future) in the official repos, provided that it's stable and no risk to users and provided that there are no license problems.