Hello again, and thanks for the responses to my question on mahogany for a SOF kayak. I found the site in the link below that has weights of wood green and dried. I was surprised that Poplar is so light. I thought it would be much heavier. I was told before that poplar would be too heavy for a SOF kayak, but I have access to some good clear S4S poplar. Maybe that would work for gunwales and stringers? Not sure about bending characteristics but I'm willing to try it.

See link below for good info on weights of wood.