It is DIY, probably by Kyosho engineers since it is a prototype. This was in the Nuremburg hobby show too.
"Here's a little sumpin' from the back room of Kyosho's booth. Obviously, the natural-color plastic will be black in production--this proto is hand-made. Power is rumored to come from a Sirio 1.5cc (.09 ci) engine (do the math, and you'll find that's 80-percent more displacement than any nitro mini engine). Note the metal spur gear and prototype bulkheads, suggesting Big K expects to put some serious (Sirious?) power through this bad boy."