That sounds like a good way to get both plans to show properly, but I'm not sure how to make the model show correctly in 3D. Since the wall on the upper story doesn't contain the window, it will obliderate the second story portion of the window. (SketchUp view below)
Dave Jochum
J o c h u m A R C H I T E C T S http://www.jochumarchitects.comMBP 16" (M1 Max) 64 GB•OS 13.5.2•AC 27 Silicon (latest build)