I want to create a custom mass element which behaves like the wall tool in the design pallette of ACAD Architecture 2009. IE I want to specify a basepoint on a crown moulding profile, and extrude that profile along whatever path I chose. As I extrude my profile I want the areas where my mass elements meet to automatically clean up in the same way that interior walls clean-up as one creates a floor plan layout. Is this possible?