Alamak, MG! You in dilemma again!
Did you write to Dr Hsu - did you ask about the warping; he did say there can be warping. In my case, there was some calcification already so it was unlikely to warp. Younger cartilage may have higher chance - but I say you write and ask how this can be mitigated, if at all, and take your comfort level from there.
I keep staring at me nose to see if does anything sans my tacit permission. So far, okay leh.
But hey, if you are concerned about a scar on your chest wall, then you may want to reconsider rib cartilage. I have a 3-4com scar 4cm (from directly below my right nipple towards the middle) - waiting to see how it heals. Looks okay thus far too!