Thanks, like I said these are kind "nice to have" things, but no real biggie. I understand DXF, but find DWG to be more robust/feature rich for 3D and is of course an industry standard (despite being proprietary). Maybe I could amend this and request 3D DWF instead?

The API, specification, and toolkit are freely available. http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=5801732

Thanks for listening,
Nick