Hey look! A couch. In minecraft? And you can sit in it?.....Yayyyyy
Step 1: Base
For the base you can do whatever you want. I used a 5 by 2 base. That counts the blocks that are gone.
Step 2: Add the Sitting Part..
For this step you dig a hole in the empty space and insert minecart tracks. Then insert mine carts. Then add the "padding."
Step 3: Sittin in the Darn Thing!
To sit in it you just hold in the screen while facing the cart. (well in mcpe anyway) Although it looks derpy the cake isn't a lie. You can sit in the couch.