Made cardboard template for back seat bottom. Cut 2-core-2 1/4 inch prepreg to size. Cut hole for seat back bracket and seat belt attach. Removed upper skin and core in three 1 1/2 x 1 1/2 areas to make hard points for seat bottom attachment to gear box. Cut and sanded three 1/4 inch phenolic blocks for above areas. Floxed phenolic blocks into cored areas. Covered hard points with 2 bid carbon overlapping onto skin. Peel plied carbon.