I have been fiddling a bit in the meantime - but I think that this is somewhat the version in box mode.
(Know that the lines are not straight in this one, but that has been corrected in the next version - love the incremental saving in Hex!)
I was thinking about first fixing this fin, than slicing the dolphin in the length and using symmetry and welding the halves together.
Or would your proposed slicing already enhance the body?
Jacqueline