as in previous commit, this simplifies the build of the side frame piece a bit. notably on this one, the preview of the piece is more performant, so I'm thinking this is a good move. the object triangle count and volume are slightly different (not sure why), but the object dimensions are the same still didn't get rid of any 2-manifold errors though :( Signed-off-by: Brian S. Stephan <bss@incorporeal.org>