Source clean, undamaged heat-treated wooden pallets of uniform dimensions, ensuring surfaces are completely free of chemicals or rough splinters. Thoroughly sand all wood surfaces using a orbital sander equipped with medium and fine-grit sandpaper until all edges feel smooth to the touch. Apply a coat of exterior-grade wood stain or matte clear sealant to protect the timber from moisture and enhance natural grain patterns, allowing twenty-four hours for complete drying. Stack two pallets flat on top of each other to achieve standard seat height, securing the upper and lower frames together using heavy-duty steel mending plates and wood screws. Attach a single vertical pallet at a ninety-degree angle along the rear edge using steel L-brackets to form a sturdy backrest. Place custom-cut high-density foam cushions over the horizontal pallet surface, covering them with removable, washable outdoor fabric covers. Complete the arrangement by placing low outdoor coffee tables, woven floor mats, and decorative accent pillows around the seating group, ensuring stable, level placement on flat turf or patio pavers.