Here is a solution for more compact storage. this is a quick step by step guide on my method for accomplishing this set up.
Setting the Stage
Next, first raising your foundation 8 clicks on your mouse wheel, carefully align it with the first ghost image you placed.
Build the Foundation you just placed
Then place a wall ghost image
you can mirror this to create 2 Foundation wide Storage Halls also, in addition you can expand in length as much as needed.
Place 2 more chests, one on either side.
Now delete that foundation, whats left should look like this.
Next snap and place a new Foundation to the ghost Foundation you set your base height with. build the Foundation you just placed and should look like so.
Lastly place the remaining 3 chests on this Foudation, i like to offset these chests by 1 slat in the foundation to create a tiered effect that hides the gap a little better.
The end result is nice and clean, there is a bit of patience involved as well as wasting a bit of resources. keep in mind the more chests you want, the more resources you will sacrifice.