I did something similar when I had a 5g over Christmas.. I lowered the water level to about 2 inches, and put the tank back in the box from the kit with the styrofoam packed around it. All the filter media went into the water, and the fish were bagged separately.
If you keep the water level low enough that it's easy to move, but high enough for the fish, it should be fine.
Just make sure they don't get cold.