: The stiffness of a beam is proportional to the width times the cube of the
: height.
: So a single layer of half ply cut 1" tall would be .5x1x1x1
: 2 layers of ply cut to .79" (1x.79x.79.x.79) would be equal stiffness
: 3 layers (1.5x.69x.69x.69)

: This doesn't consider any strength lost due to cutting the grain short or the
: corners.

: The wider surface might be more comfortable on your thigh.

Why don´t laminate aboute 3 pc of 3 mm / 0.12 in thin plywood? When I was aboute 12 years old I made a skateboard like this. I first let it soak and then glued it wet in a form at presure. I think it will be possible to get the sharp corners that you need.