Sabre installs a nice plywood holder inside the cockpit locker. The boards are stacked one upon another with the top board on the outside. The group of three boards (in my case) is set inside the holder such that the long ends are vertical. For instance, each board is something like 6"x20"x3/4". Stacked upon each other it's 6"x20"x2 1/4". They're rotated 90 degrees to vertical and dropped into a plywood holder just inside the locker that has an opening about 7"x11"x3"
Sabre 38 "Victoria"