Small update;
Here is how the rear of the batterieholders are supported;
It also helps keeping the servohorn from bending, since it sits at the bottom of the truck.
The bulks needed a bit of work; Initially these holes are used for the nitro enginemount. they come out under an angle. I drilled the holes thru (straight) and put two screws in it, that are screwed into this threaded spacer;
and when put in place, it looks like this; Next thing to do is drill a few holes..