Not sure what cutting lines you are referring to? I will try to get some outdoor pics. The weather here has been suck lately!
Sorry, i'm a big CNC fanatic. I made a 1/16 scale guitar out of aircraft aluminum (decorational purposes only, totally not playable or to scale, or even stringable for that matter), and the bit left these nice swirly marks all around the guitar. Most things done with CNC mills leave those "cutting lines" behind, and they looked beautiful on that aluminum body. it gave it almost a holographic look!
The cutting lines in your guitar are gone now, because you sanded it, so don't worry about it I just got excited because i noticed them in the contours in the early pics.
Gotcha!....I thought you could still see cutting lines...after I sanded. You made me do a double take! LOL
Do you work in a CNC field?