ORIGIADrawer Organizer Stackable Jewelry Accessory Tray Display Storage-4 in 1 - Black

If the smaller trays fit "inside" of the large tray, how is it possible to put jewelry in the large tray without crushing jewelry under small trays?

What are the dimensions of the smaller trays in inches

Is it possible to only purchase the large trays? If I wanted to purchase 4-6 of the large 13" trays only without the insterts?

Does this come with two covers so i can put items in all four and stack them and put the cover on both levels?