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The transom has wood in the large central area extending to the ski/lifting eyes on both sides. On the outermost portions of the transom, there is NO wood that I know of.

The bracket in the upper photo is screwed into wood. That's what makes this swim platform solid when standing on it.

Here is a shot of how the platform grab rail is mounted. It is not in wood but seems to be sturdy.
Remember though, almost all of the weight on my platform is carried by the bracket, NOT the grab rail.