As I envision this concept, imagine a single strip of 1/2" plywood that is 2 inches wide and 6 feet long. Now imagine 36 such strips stacked on top of each other. Glued together, they would make a single plank that would be 18 inches x 2 inches by 6 feet long, essentially the same overall size as the blank I glued up to make the CB. The edge grain of each plywood strip would be facing out, not fore and aft as would be the case if you laminated up 4 pieces of 18" x 6' long 1/2" plywood.
Plywood CB's and rudders seems to lose their strength and fail when repeatedly flexed across the grain (grain running fore and aft with the board). My notion would to turn the grain 90 degrees where the strength of the grain would resist the flexing. Same principle as vertical grain vs. flat grain.
Taken one step farther, if you drilled holes in the centerline to register the piece in the lamination stack, then started shaving fractions evenly off each side, you could start to build in the shape of the board as you stacked it up.