Nature in Cardboard

We were required to pick a natural item, and recreate it from cardboard.  I picked the top of an acorn because I liked the features created.  I would like to see if I can create it as a vase that might be used later.

Here's the original idea I scribbled to begin my thought process.
Trying to create a flat base and work my way up from that.  I made a small version to see how it would work, but it didn't stay together.  Now need to take a different direction, and see what we can do to make it become what I want.