I have a simple addition to a rather large structure, the addition is small. What I'd like to do is draw my addition, then in elevation, and maybe plan mode, show my addition against the existing house. The homeowner has provided a PDF set of plans of the house when it was built. I have no intention of using the plans for anything other than their addition and it will save the client some money if I don't have to re-draw the structure. Any ideas?