Went to lowes and got the straightest 2x6x10 I could. Its nice that the price of lumbar has come down. I built the bending brake and bent the elevators so that there was no bulge or bow. I think I got them pretty close, but I will make finer adjustments once everything is clecos together. After reading some things on line, I went with an 1/8” dowel rod to get the appropriate radius. Seemed to work well. I didn't really have much of an issue bending the edges, they went pretty smoothly and easily.