so I cut a new bone nut for this AO thinline(OEM was set inboard 1/4" on the low E making the string spacing tighter than it could be, and the high e very close to fret ends). removed the OEM nut and found the seat of the nut cavity curved(bottom of nut also) to match radius of the FB. why do they do this? For me, a straight seat area is so much easier to cut and keep really dead straight and flat. didn't have anything right off as in a spindle sander to match that 9.5" radius, and I just didn't want to go around the house trying to measure bottles. I cut it by hand and filed away and ended up with satisfactory bottom profile, but goodness a flat seat would be so much quicker and to me just a little bit more depth and solid. brought it to work and took some xrays to look at the truss rod-thinking maybe it goes up to that area-but no. TR stops about halfway between nut and 1st fret. thought you'd enjoy the other images of the chambered body-sorry for the artifact looking pics, took these with my phone straight off the screen and those wave artifacts show up in phone pics. frets look crazy because they are curved and I didn't have the neck parallel to the imaging beam, so you have all these curves not lined up-just wanted a quick look.