Every giant LEGO display starts with a good foundation. Why cheat and use plywood you might ask? Well, in order to set up all the cars and mini figures, we had to be able to walk down the streets during set.
And here is the same wooden table with a few layers of LEGO added.
I totally recommend checking this exhibit out. The Museum is 2 walking minutes away from the New West Skytrain Station; and entry is by donation.