I had to move things around when I installed the Mamba Monster motor and ESC, and ran 6S for speed runs. Now that I've gotten the speed runs out of the way, I had to come up with a more conventional setup. Thanks to the giant ESC that Mamba provides, that meant relocating the receiver, the best alternative place is in the front. I made this mount to hold the ESC in front of the steering servo. It was a a little thin around the front screw holes because the chassis narrows, so the front has a slight overhang (see picture of overhang on chassis). If I decide to rebuild this I'll hug against the chassis and use a more durable Alloy 910 filament or something.
Designed with 123d, and thingiverse doesn't allow upload of 123d files, so if you want to modify this, ask and I'll send you the design files.
It's thin so infill really doesn't matter, top and bottom laters are combined anyway, there's really no infill.