I made an Awesome chest. not with redstone. not infinite. not triple, not QUADRUPLE, I made a functional Super Chest made of 5 CHESTS Using /setblock ~ ~ ~ chest            .              i did it 5 times. it looks wierd though! :D I was surprised it actually worked, but it did.  I placed the chests in a + shape for it to work. you can do the same in your world. 2 chest blocks are (amusingly) invisible but functional. to have the space of 5 chests when opened, open the center chest. here is a diagram of what you click:

key: chests you dont click on = I         chest you click on = O       air =  L

   L  I  L
   I   O  I
   L  I  L