I am not a wizard in the weldments aspects of SolidWorks, but I have a couple general questions? Is it required to use the 3D sketch to create the "wireframe" of a weldment feature? I have a product that I would like to produce on the top plane because all of the various standard structural members would align on that plane. Also, I have some sheet metal parts that need to be added to the weldment assembly, multibody part. What are the best practice methods of accomplishing this?