@scottd thank you for the reply.
I have tried the mass approach but get the “Can’t make Face Wall shape” error. See image below.
I can get the skin in as material wall, but it really does not do me any good because I cannot apply any additional data to it.
I have modelled the mass in Revit using points that I triangulated, and it takes the wall by face command. I wanted to use Rhino’s superior modelling to generate the mass. My hope was that there was a way to generate the building envelope using a Brep and apply the wall type to that.
Maybe I am looking at this the wrong way.