I will get around to listing directions for this mannequin soon. In a nut shell, my wife took an idea she found and tweaked it. The mannequin is not stuffed with anything believe it or not. We made a duct tape "mold" from an existing mannequin, wrapped the duct tape mold in aluminum foil, then took pieces of CLOTH soaked in plaster of paris and placed several layers of those on the mold. Eventually, we partially split the plaster of paris body off the mold and then used more plater of paris to make the mannequin sturdy and to seal up the side seams. So far, I have had a uniform, body armor, and chest rig on the mannequin and it held up superbly.
I plan on making a step by step guide on how to make one of these mannequins. I will be documenting the process with the next mannequin. It is not hard at all, but does take some time.