BMatthews

With a top and bottom cap plus webbing spar system it's not the bending strength that you're worried about. Instead it's the tensile strength on the bottom cap and the compressive strength on the top cap.

As for the fishing line there's lots of far better alternatives. You want something that won't stretch. If you can buy a short length of kevlar cloth from a fiberglassing outlet and unravel a long strand of that then this would be about as good as you can get. Wrap it tightly and then bond it in place with a coating of glue of some form. Even glass fiber would be good but you'll probably have to slightly round the corners and use a light weight cloth so the threads are very fine to resist snapping at the sharp corners. It IS glass after all. If you can find some carbon cloth that would work great as well.

Some shops provide tow fibers. This just means that it's a long bundle of non woven fibers that you can use for stuff like this.

Anyhow, without looking up a chart of tensile and compressive yield points for the woods I'm pretty sure we have seen in the past where good sitka spruce is better in both regards. So if you can find some nice tight and straight grained spruce I think you would be better off.

Or cap the bass with some of that 1/2 x .007 carbon fiber unidirectional strip material.