[PJ]

Don't put Bondo on a '66 Tele, no matter what people might tell you.
There are better ways to address that part of your project. At least do yourself a favor of letting a pro restoration guy look at it and give you the options before you tackle it yourself. I do plenty of body and neck refin work, but I wouldn't touch a '66 myself. The restoration pros work on everything from 1800s Martins to 50s Teles, Strats and LesPauls - all among the most highly valued collectible guitars in the world!