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I know of a few people who have replaced wooden bits with HDPE bits. HDPE is a type of plastic, sold a few different ways by different companies. There are different grades and such, just like with any synthetic material.
In general terms, though, HDPE is quite durable, easy to work with (normal woodworking tools and techniques work overall), quite UV resistant (some HDPE more than others, of course, but it's all superior to canvas or wood) and it doesn't rot or splinter.
It is heavier than most species of wood. It can be purchased in sizes ranging from 1 foot by 1 foot sheets of half inch thick to 4 foot by 8 foot at 4 inches thick. Probably bigger, even.
It's an interesting material, lots of people have used it with success, and is probably worth your time to look into.
Post pictures of your completed project!
Edit: Oh, it does float, though just barely. specific gravity is somewhere around .96, I recall, though there are some variations in different builders/grades
... or I'm wrong.
Living aboard, currently in the Chesapeake
O'Day 37, still new to us