Our RV only came with a window for the top bunk. That left the lower bunk my son uses as a dark cave. Before our big trip out west I wanted to add a window for him. I am adding it directly below the window for the upper bunk so the stud spacing works out well with a window of the same width. I was able to get a window of the same brand (LCI) as the existing windows so it should blend in well.

Hole cut between the same studs as the upper factory window
Window Installed