It's is a really easy built. To know how you build it you can see down below..
Step 1: The Start
On this I can't really tell you how much blocks I have used but it's really easy to build and you can pretty much copy the pics it's really easy as I said..
It's 14 blocks round (both sides)
And 14 blocks high all together.
Hope this goes really well for you it's really easy and O yea I have used coloured clay for my minecraft chest. If you wanted to know.
Hope this goes well BYE