Here's a link to a new artbook/mook by famed mecha designer Kazutaka Miyatake.
http://www.laputa.ne.jp/gb.html
He also worked on the concept art for the anime OVA version of Starship Troopers. Here's a link to the making of a 1/6 scale garage kit of the Powered Suit designed by him. IIRC, it was displayed at Wonder Festival Summer 2005 by Liquid Stone and was retailing for 70,000 yen.
http://homepage3.nifty.com/nasuken/