A selection of small thin strips is definitely a useful addition to your spares box. It has multiple uses including gap filling as here, but you can also use it to create extra details such as fuselage ribs, straps for tanks and boxes, window frames, jerry can and bustle (the big mesh baskets fitted to tank turrets) frames - all sorts of stuff.
Forgot to mention. You said the gap you have to fill is not the same width everywhere. It might be an idea to carefully square up the fuselage and rear of the window frame with a file or sander so they fit together with no gaps. Then you can slide the window forward by whatever distance you need so it fits the front. That distance will be the width of your strip. That makes it a neater and easier job than filling where you can with strip then gap filling with PVA or similar. If your gap is then wider than the strip you buy - use two strips.
Forgot to mention. You said the gap you have to fill is not the same width everywhere. It might be an idea to carefully square up the fuselage and rear of the window frame with a file or sander so they fit together with no gaps. Then you can slide the window forward by whatever distance you need so it fits the front. That distance will be the width of your strip. That makes it a neater and easier job than filling where you can with strip then gap filling with PVA or similar. If your gap is then wider than the strip you buy - use two strips.
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