(NOTE: This can be done in a variety of ways.)

Let's start with an extended L hitch. Place a shoulder sit and an elevator next to it. On count have the elevator extend their flier up so that she is standing on 1 foot (the foot away from the shoulder sit). When stable have the flier pull her leg straight up to the side so the flier in the shoulder sit can grab the leg and place it above her head for the "L hitch".

This picture has 2 Extended L hitches facing outward and an elevator in the middle. You can build different extended L hitch pyramids by either placing more people in them, connected the flier's arms, Or rearranging.