I had to purchase some 1/8 plywood from Wicks to make the skin for the underside of the center section. ($29.00 for a 2x4 sheet!!) Cut it 24 x 25 3/16 and fit it to the opening. Layed out and cut slots for the wing/wire attach fittings. Started process of setting up for install of cabane fairing or Canoe. This should be fun.