Step 4More Levels and the Top
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The third level is oriented the same way as the base, but because it does not interlock with a lower level, it will have to be glued to the tier below. Attaching the top will be necessary once your table has reached the proper height. If you ended with the bottle bottoms in the air you can apply some adhesive directly to them and set your top on. However, if the necks are in the air, you may want to put bottle caps back on them so you have more area to apply the glue.
When the top is applied tightly you have technically completed a sturdy yet not-quite-awesome-enough table. Let's check out step five for some more ideas.