Use Room for the editable shell of the showroom.

Controls:
Width: changes room width in meters. Range 2 to 20, step 0.5Depth: changes room depth in meters. Range 2 to 20, step 0.5Height: changes wall height in meters. Range 2 to 6, step 0.5Controls:
North Wall: shows or hides the north wall role geometryWest Wall: shows or hides the west wall role geometrySouth Wall: shows or hides the south wall role geometryEast Wall: shows or hides the east wall role geometryFloor: shows or hides the floor role geometryRoof: shows or hides the roof role geometryControls:
Show Grid: shows or hides the placement grid overlayAlways Ground: keeps object placement grounded to the floorSnap Now: moves placed objects back onto the floorGood to know:
Snap Now is only useful when there are placed objects to re-ground