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Mtown- Thanks for that information on the Specialty cushion fastening detail. Unfortunately, the Specialty detail is not the way Whaler designed it.
Wood screws into the plywood base are nowhere near as strong or permanent, and the seat plywood can rot, causing screw failure. There is a lot of stress on these connections.

I have owned Whalers with an RPS since 1986, and every factory cushion, and the later Hall's and Anderson replacements, have used threaded inserts for #14 machine screws, for a total of eight. This also gives correct and easy placement for the legs automatically.