thanks
first point, I was just too lazy to build something made of carbon (I only have simple tools); and second, I didn't want to waste that beautiful titanium. and it's cool to drive around something that used to be in my bone...

first, I wanted to get some wedding rings made by that rod, but its impossible to forge titanium.
it was a compound fracture, and the bar got removed from the shinbone 1,5 years after the accident. and now, it's useful again.
as I have learned from my very first brushless conversion with that "ansmann virus" buggy (cheap copy of a hyper 7 pbs), the chassis gets bent really easily. what can you expect from a budget product... so without something like that, I will soon have a problem.
the carbon/alu battery "tray" also stabilizes the chassis.