Hothir Ethelnor, are you using some kind of tailor's dummy, or something like that for tweeking the shape? (Can't look at the pictures...)

I was just thinking of a contraption one of my family members has that's like a torso made of adjustable and removable bars and rods that make up a grid or scaffold, but I've also seen a pillow-ish type dummy torso being used.

Look forward to following the thread as it develops.