What missing window? Acme window and door just finished repairs.
Mark
Nice! Problem solved. Now if only it were that easy.
Well, you could consider the approach of using rubber molds to duplicate one of the existing windows as real-life Photoshopping
If your kit didn't come with any extras, you're basically dependent on someone kitbashing another of these kits into a smaller structure needing fewer windows than the as-designed building (or enlarging it to a degree less than 2x the original).
If I were in this predicament, I'd opt for the duplicate with mold-and-resin tactic, unless the kit did normally come with extra windows (or the manufacturer keeps extras on hand)
---PCJ