Quantity   Component name
1 × 1/2" 12"x12" Steel Plate (A36 or carbon steel)
1 × 1/4" 12"x8" Steel Plate (A36 or carbon steel)
4 × 2 1/2" x 5/8" x 3/16" Steel U-Channel This can be hard to find. MetalsDepot carries is for a very reasonable price cut to length. Stock Number C121258216
1 × 4' of 1/4" x 1 1/2" Steel Sheet Hot Roll Flat (A36 or carbon) Used to assemble to upright
1 × 18" of 2 1/2" x 1/4" Wall Square Tube (A500 or Carbon Steel) This is the pallet arm and will fit inside the spaces made by the u-channel