I know many modifications need to be done to this concept drawing was just a quickie. Any ideas on improving the design would help. I've already changed the lower leg portion on a blender model as i realized the set up in the sketch wouldn't work. Materials for the stilts i figure should be carbon fiber and Nylon? straps with either elastic or some kind of stock absorber/spring or screen door closer thinking of having it as a contraption to help the leg extend and take stress off the ankle joint for standing and propelling forward.

Anyways any idea suggestion will look over any comments thank you.