Thank you so much for your help guys, i finally managed it !
Dave, I hope you don't mind that I did not use your design, the fact is the lines were not exactly how they are in the real model, but it was so cool for you to send a model I could not say anything ! I hope we're good
I'm afraid I have to say, i did not know about the birail tool...so once I did, i managed to make 1 "slice", extrude it into nice quad polys, and duplicate it ! For now i added a smoothed square poly inside to fill the gaps but i will work on that. I will also take care of the pointy part of the slice, as seen below the narrow part of the yellow slices are not perfect. and I will measure the exact proportions off the slices on a real model, to get it right !



Thank you all for your answers !!