Great job my man! I also have done a pad or two........but let me ask a question or two(cause i'm always learning). Your purpose of carving out the wood is to fill in with expoxy to make a fit that won't shift? Also the burnishing of the line. Did you use heat or is that pressed on? I havn't tried that, but wouldn't think you would be able to apply enough pressure? What leather and thickness was used? The last pic of the pad looks like buffalo scrotum leather.

Looks very professional!
Thanks and take care!