When BK was running for Losi, he used to do tons of skunkworks stuff.

I remember seeing him at SoCal with a bag of chassis that were all custom cut for him. Well, at least somebody cut them in half on a mill so he could make whatever length he desired within 1/8" by CAing the front and rear sections back together.

We never saw any of that stuff.

When Brent Wallice won the Reedy sedan race, I remember him building a sedan just for RC Action to shoot for the magazine. "Part" of it was for sponsors, part of it was outright subterfuge.