Buy a 48 inch wide utility trench - Eric'sons Manufacturing
Tile Redi WonderFall Trench 48 in. x 48 in. Single Threshold Shower Base with Right Drain and Tileable Trench Grate WF4848R-PVC - The Home Depot
Tile Redi Redi Trench 48 in. x 72 in. Single Threshold Shower Base with Back Drain and Tileable Trench Grate RT4872B-PVC-TT - The Home Depot
SUPER MEN TRENCH, DARK BEIGE, SIZE 48 - Sealup
Tile Redi Redi Trench 48 in. x 60 in. Single Threshold Shower Base with Left Drain and Solid Brushed Nickel Trench Grate RT4860L-PVC-BN3 - The Home Depot
Burda Classic French trench: Sewing pattern | Ribblr
Trench Coat Sewing Pattern for Women Sizes 46 / 48 / (Instant Download) - Etsy