... first floor need be flat before assemble house(2) two or three floor-The second and third floor is 18mm ... weight, convenient for shipment and transportation. 7) Beautiful appearance, virious colors and shapes for outer and inner roof panel and wall panel. 8) Various ... 1) Dimension: Length, width, height, eave height, roof pitch, etc. 2) Doors and windows: Dimension, quantity, position to put them. 3 ...