First of all we need to know what the 16 x 4 area is. is it yards, metres, inches or what. What size are the pieces of turf?
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1 x 1 = 1 square inch area 4 x 4 = 16 square inch area you need 16/1 = 16 pieces
Assuming the plywood comes in 4' by 8' sheets you would need 6 sheets to cover a 12' by 16' area.
32
144 Get 160 to be safe.
2.37 cubic yards of stone for every 3 inches deep it needs to be