About this 3D model

Joint parts to build a corrugated plastic (4mm thickness) housing for 3D printers. Need 5 same square boards. (Or 5 square/rectangles, must adjust each side length) Example of side length of square: 18" for AFINIA/UP!PLUS series "CPHousing_all.stl" includes: cornertop-back-left x 1 cornertop-back-right x 1 edgetop-back x 1 edgetop-left x 2 edgetop-right x 2 edgeback-left x 2 edge_back-right x 2