WPL JJRC B1 B16 Q60 Q61 etc rear bumper base remixed for adding weight

I really liked both designs I remixed from, but I saw a bit of an idea to try. These WPL and JJRC trucks are pretty darn light weight. Which, in theory, could be bad for traction. And in some models they're a bit top heavy and can easily tip over. So in order to combat both problems with a cheap solution, I decided to add weight in the form of copper BBs or lead shot to empty areas anywhere I could find them in the chassis beams and bumper area. As they were, it was not nearly enough to add sign