Tim, nice work on the sink and magazine rack. It's always a pleasure to see the ideas other's come up with.Especially when it comes to cabin style boats
I think that depending upon usage, fiberglass cloth in your sink might be more resistant to damage. One thing to consider though is the sanding necessary to get it smooth enough. Seems like it might be difficult to do that in a confined space without having to resort to manually sanding (yuk!!)
At any rate, keep up the good work. It's looking like you are getting closer and closer to launch day.