what type of wood shelving to get for garden shed in Cairns?? marine ply??

I am getting a couple of sets of steel shelving 1500x600 Rivet Shelving | Rack n Stack Warehouse but have wooden shelves, instead of getting the standard chipboard shelves that dont like moisture too much out here in Cairns in a garden shed i was thinking of getting the steel frame only and getting some marine ply from bunnings for the shelves.
What ya reckon about this??
Plywood Marine Aa Grade 2440x1220x12mm Hardwood - Bunnings Warehouse

or even structural CD ply??
Structural 2400 x 1200mm 15mm CD Plywood - Bunnings Warehouse

would this above type of marine ply or structural be suitable for holding around 200kg of weight with this surface area?? what one would you go for if your shelves??


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