The big cut was nerve-wracking, but ultimately a success. I was really careful about being sure the heat lamps were on, and got the temperature up to about 80 (the weather was outstanding!). I kept stopping to be sure and tape the un-joined sides together so that no opposing twist developed between the two halves to promote a crack. Col Rich Donnelly assisted in the "keep the two sides together" effort.
Learned a big lesson: Even though the blade's leading edge is on the line, WATCH THE TRAILING EDGE. If I allowed the blade to turn even slightly from perfect alignment with the cut line, the trailing edge will dig out a wider cut hole.
