Jerry, I think your window is a little low.
19" works better on my model than 18". I can't say how the measurement would on other people's models; they have to figure it out for themselves.
I can't get a perfect photo-match, so I'm bad at matching and/or the 3D construction is off. Some of the window frame don't quite match. The 3D cartons sort-of line up with the Dillard photo; will have to nudge their placement or try a new photo-match.
For now, it's pretty close to working and doesn't interfere with any trajectory lines projected from the SN.