Very cool...i admit i skipped thru the video some, and maybe you talked about it, but what length bit did you use having to use 2.5" material?
Also have you experienced any cupping or warping after having cut away so much material? I did a deep cutting and carving on some 10 year dry walnut for a blanket chest lid and it cupped terribly after releasing all the material from around the carving. Excellent work!