Refine 2D profile from AutoCAD into valid Inventor sketch - help -

Hi, I guess that many of you have had some struggles now and then with following situation like me:
A customer send me a bunch of complex 2D profiles in AutoCAD dwg-files. My job is to create some parts in Inventor R11 from these profiles. If there is any AutoCAD tool lsp/ vba for refinement of profiles I would like to know.
Basically I do as much refinement in plain AutoCAD as possible, where I ensure that only the wanted profile exists in the dwg-file, next is chekking of true closed area with the BOUNDARY command, then remove overlap + duplicates with express tools OVERKILL command, however these procedures cannot close open profiles within a given tolerance. The BOUNDARY command only tells if there is a problem, but not where. In MDT surface module (wireframe handling), there is a nice command AMJOIN3D, where I can pick all line/ arc elements in a profile + type in a tolerance for closing open gaps, that tool would be perfect if it wasn't for one big limitation: AMJOIN3D creates a multi-point lwpolyline only, that means that arcs also are converted into multi-point lines as part of the created lwpolyline.
Inventor's sketch doctor can't do the job since the result of combined end-points often results in a self-intersecting loop, and the sketch geometry is then destroyed.
So if anyone know about some lisp/ vba tools for handling that part, I guess that many Inventor users would be happy :-)
FUT: alt.cad.autocad
regards Lars

I'd suggest instead of the BOUNDARY command try BHATCH. 1.) Here you can retain the boundary and also set a gap tolerance. (May be at first you must pick the "More Options" button). After creating the boundary this way you can delete the hatch. 2.) I think you don't need the overkill command, because you get a correct closed profile (correct profile) without overlapping lines/arcs. 3.) I would not delete all unnecessary objects, but export the needed profile(s) into a new file (WBLOCK).
HTH Juergen