Remove internal/overlapping areas of an object

I'm generating an object that is created from a single tightly arranged bezier curve that is swept using the variable pipe command. The thing I now want to do is remove all of the internal geometries (the parts that overlap into each other) so that I can be left with a pure, hollow 'shell'. How can I go about doing this in Grasshopper? Any plug-in recommendations that might accomplish this? Thanks!!!