How to build this Awesome Toy Box 2.0 stronger and more durable!!

I love building these durable toy boxes. This one is the most durable yet dimension are 18x20x40
cut list
2x4s
4- 11inch
4- 20 inch
4 - 35 inch
2x4x1/4 ply
cut 12 inch down center
then 12 inch of each end
add 1/2 inch dado to receive the ply poket hole together and booom a toy box!!

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