Tips on preparation of custom outlines:
Save the document as a text file in a desired location.
Be careful selecting the center point when reading from the drawing file.
Make sure your arcs are broken up into 180 degrees or less as MLM cannot recognize arcs greater than 180 degrees.
Ensure tangent constraints are all in place.
Do not use automatically generated drawing views of part files. You can however open a sketch from the relevant part file and copy the sketch into a drawing file and use that after constraining.