Reply by Kazooman

I think we are on the same train of thought here. However, by starting in the middle as I suggested you can rough out the curve on both sides without the need to fasten a runner for support. Then the remainder of the wood can be cut off leaving two nice pieces for other use. If that cut would be too deep for the maximum height on the tabesaw it could be started with the power tool and finished by hand. Turning so much good stock into sawdust by dadoing it away seems a shame.