Screenshot? What does the wireframe look like? Have you tried using a standard unwrapping workflow? For example, look about 1/3 down this page for "Example: To use Peel Mode" http://docs.autodesk.com/3DSMAX/15/ENU/3ds-Max-Help/files/GUID-EA10E59F-DE7F-497E-B399-6CF213A02C8D.htm
How can you unwrap complex shapes like Imported Inventor fusion .STEP files? - I have tried to use the projection modifier, create a shell that matches the shape and project the UVW's back to the imported body object. This does not work correctly. - I have tried unwrapping the body object itself, by first converting it to…