Another shoulder pad that that may fit to this concept is MOVCAM shoulder pad. It is low profile and reasonable priced:
https://www.bhphotovideo.com/c/produ...r.html/reviews
http://www.16x9inc.com/shop/shoulder...-sony-fs5.html
This shoulder pad probably require some cheese plate and rail block in front. MOVCAM also design a very interesting system around it. See this video:
https://vimeo.com/80040349

Wonder how metal plate connected to the foam pad. Maybe foam pad have some metal core plate inside? Or maybe it is made of hard plastic? Anyone use this shoulder pad before?