V4 beta Oct-17-2018 available now - SubD to NURBS conversion

 From:  Frenchy Pilou (PILOU)
9100.216 In reply to 9100.215 
Seems remember that maybe exists some thing for similar volumes ... not sure that can be apply on your case...

Your solution seems many more easy! :)

EDITED: 23 Jan 2019 by PILOU