Please follow the LJ Cut below, to find the floor plans for the Weasley Wizard Wheezes shops:
Weasley Wizard Wheezes, Diagon Alley
First Floor (The Shop)
Second Floor (The Flat)
Third Floor (The Attic)
Weasley Wizard Wheezes, Hogsmeade
Ground Floor (The Shop)
Basement (Store Room/Werewolf Clinic)
NOTE: The orientation of the Hogsmeade shop is losely based on
this map of Hogsmeade. The secret tunnel runs out of the Patient Treatment Area, under the road and off into the woods, about half a mile away from the village.