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Looks to me like the manufacturer was getting continued request for bigger boxes!
If you had multiples of the exact same box (every one has slightly different dimensions) you could probably mix & match to come up with your own unique combo.
Here's an interior of a jewelry box. If you used this type you could use the earring racks to display small items or remove them for a bigger space.Here's a Videohttps://www.youtube.com/watch?v=Z2xgdQbTCm0
Here is a video that shows something called a "Japanese Saw" that might be better than a hacksaw for cutting the dowels.Look at 8:05.https://www.youtube.com/watch?v=Dm8xIf41jEE
There are several variations of this box available or previously available. You can find some of the older ones on Ebay. There are makeup and jewelry boxes. the Makeup boxes are all similar except for trim and number of levels. Ditto the jewelry boxes. The main difference between makeup & jewelry boxes is that the top level of the jewelry boxes has several racks for earrings. Take a look at one of the jewelry boxes before you buy.