Thanks for your help Marissa!
In the revision you've attached, the object node works except when you try to change the frame and sash. I'm assuming the dim nodes titled Frame and Sash need to be connected to the origin in order to center under the original rectangle, or perhaps by somehow using the center point output of the getRectangle node.
This is why I had posted on the other thread about centering/aligning etc., it seems like there would be some unnecessary scripting involved in getting the rectangles to align responsively.