My ant, FireArrow, runs most of the same stuff Ribbs' bot has/will have. It runs a 1/16 inch 7075 aluminum shell with a 1/16 inch steel front wedge. However, it uses Silver Sparks instead of Ribbs' Gold Sparks. The only difference is the metal gears in the silver ones as opposed to plastic gears in the gold sparks.
My beetle, Nocturne, according to the ebay seller, runs "1/8 titanium wall armor, bottom plate is formed .060 thick titanium, top weapon assembly and walls are 1/4" magnesium, top cover is ti and carbon fiber."
Nocturne uses
Kitbots 1000 RPM motors for drive, and
this motor for weapon power.
FireArrow's still being rebuilt and I don't have all the bits for Nocturne yet so I can't post internals of either robot, sorry.