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Haines V16C. cut out old stuff, which had been replaced before. 16mm marine ply from Bunnings ( damaged cnr on bottom of stack ) $60, water proofed edges and under floor, can't remember the name of sealant but is still in shed. $30. Sealer around stainless screws and screwed it direct to the stringers. If it stuffs up in 1-10 years, just wack anothry in. Sanitry grade around edges and Bob's ya Uncle.
Depends on your stringers as well. Mine where all good as is transom.