Well if you can export a surface or solids he should be fine with that. SW can open dwg 3d files just fine. You can also export as other formats such as stl but you may be best to just leave it as a dwg. If he loaded it SW has a DWG editor program that is similar to Acad, well Acad 07. If you want to upload a small portion as a test im sure one of us could open it to make sure there are no problems.
If that is a problem the person with SW should be able to use the xyz data as an excel sheet