I used to have a Hyper 7. I put the stick pack into the RC Box. Of course the stick is longer, so I drilled a hole into the box at the front.
The stick stuck out a bit of the RC-Box then and I just sealed the box with goop. The receiver (Spektrum, so not the smallest) still did fit above the battery (cushioned with foam of course).
This surely gave the car a much better CG and cleaned it up optically. The guy I've sold my Hyper to still uses it like that.

But if you have a good charger, want to save weight, have better runtimes, don't want to cut open your RC box, check out the link I wrote on my above post. If not, don't.