Let elastics through like the picture. In the picture, elastics are represented as lines, but these are loops actually. Light blue are hooks. Purple line is a elastic passes from left arm to right arm. Green are elastics through from legs to the head. Pink balls are joint balls. These balls have holes which are ways of elastics.
S shaped hook is attached on the brainpan's loop. Green lines of elastics pass through the hook.
Assemble by through elastics in all parts. That's all. She become a doll. She has a height about 21cm.