Modeling exercice...

 From:  Finema
7196.1 
Hello,

By way of exercise, and especially to perfect me, I try to model a rather complex decanter.
I thus began to put the plans in bottom and to draw main lines.
But at the time of creating "petals", impossible to find the "technique" most squeaky clean to realize that.
I just ask you how you would make to model this thing.
Ps: I tried Projections, Boolean, Cuts, etc. but in vain.
Thank you.

EDITED: 9 May 2020 by FINEMA