I can tell you these pull heroically in Lake Michigan when we are fishing for salmon.
Sunday, April 30, 2006
I found cedar to be inexpensive, durable and very light. I have yet to find a home improvement place that doesn't carry it. Pine will work fine also, it just won't float as high.
Don't get too hung up on making the angles perfect. I made a custom jig to use with my table saw because I wanted them to look nice. A bandsaw, reciprocating or even hand saw would work fine. If you are brave, cut the angle and the bevel at one time. Clean up all with sand paper. A handheld belt sander works nice.