What lies inside

Now we entertain the scenario that we have a huge building
But we really don't know what lies inside this big thing
I'm sure it's got something to do with processing chicken feed
I'm sure the interior if hallowed out would be a sight to see
What would you put in that empty space?
What would you put inside?
If we had this empty space we would first fill it with air
We could use it as an echo chamber with lots of flair
I wonder how much candy it would take to fill it up
The volume of apple cider in there would really be a lot
I wonder how long Jay's beard would have to grow
In order for his whiskers to fill the space we know