tumblehome
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90% of the wood seats out there whether factory made or by hand are made of black or white ash. Black being lighter and more springy. The other 10% are of other hard woods like cherry, mahogany, or other woods. While I want to say that spruce will work well, I would be a bit concerned especially since they are 3/4" thick. You didn't mention the species of spruce that you are using. Sitka spruce is a but more resilient than say, white spruce. But all spruce is a softwood, and while flexible, might lack the strength you need. I'm just not sure.
As suggested, place the finished frames on something that simulates their placement in a canoe and sit your butt on them and see how they feel. It takes 8 hours to hand-cane a seat and you don't want to find out after they are done.
Tumblehome
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