On my 23 I used fir for the transom and OKoume on some bulk heads, and meranti for the sole. At the time I had access to a warehouse full of marine plywood and I chose what I like best for each application. Okoume and Meranti finish very well with just a light cloth, fir needs more glass to keep it from printing through (or checking). I prefer fir for a transom, it has great properties, it get covered with plenty of glass (no concern with printing), and it happens to be about half the cost of Okoume.
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