How do I add a window or faux window to a modern hollow interior door?




How do I add a window or faux window to a modern hollow interior door?
I want my under-the-stairs half-bath to have a whimsical Edwardian feel. I’m attaching a photo of what I hope to achieve.
I’ve considered cutting out a window, frosting it, and adding the decal, but to do so would actually require cutting two windows—one on each side )the outside one with the decal and the interior one as plain frosted)—plus framing on each side for a hollow door.
Is there another option besides replacing the whole door? Something faux?

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I think this project might be of some help:
https://www.hometalk.com/diy/repair/home-exterior/how-to-add-a-window-into-a-door-and-why-you-should-do-it-36764336
HOW to Add a Window Into a Door and WHY You Should Do It!
I think your best bet would be to find a door with a window in it. An architectural salvage place would be where to look. Also if you post a pic of the bath and door it would help to get answers.
You wouldn't need two sheets of glass you could but the decal on the frosted glass. Look into plexiglass too. That might be safer than real glass. Framing glass into a hollow core door shouldn't be too hard you can use pre milled trim pieces to hold the glass in place.
Could you clarify why you think I’d only need to cut one side? As it’s a window, I think the backside of the inner layer would show through the glass, wouldn’t it? I want the decal to be clearly visbale as light were shinning through.
Though, as I’m typing this, I wonder if painting the backside of the inner door white wouldn’t make it seem as though it’s see-through.