I think that the (boringly named) Powerpacks should be made to be vertically stackable, and renamed "PowerTower"((tm), but I'll give the trademark to Tesla.) Based on the photo of Elon beside a Powerpack at the launch, I estimate them to be about 5' x 18" x 18". That's 11.25'^3. Now the Washington Monument works out to be about 1,125,000'^3. So a really nice PowerTower would be 100,000 of these, and store 10GWh! And good to look at, too! And even less footprint than a single pixel at the corner of Texas!