The colored plates on the sides and ends overlap.
When you install each plate, the edge overlap should be accurately placed on the front steel plate and the steel plate clamped before and before the steel plate is fixed at both ends.
A simple and effective method is to use a pair of clamps to clamp the home plate. The plate is placed along its length, especially the upper end of its end requires the participation of pliers to ensure that one end plate is in place and the end of one turn is in the correct position to hold the plate. The clamp should always be perpendicular to the splint.