Decided it would make more sense to move the power pieces and mount to the side of the motor mount. Good old hot glue will do. I know I'm going to want to up the LiPo from the 850mA to something more like 2200mA to give it a chance to last a while. Since charging was also going to be a deal I decided to add a permanent USB cable so the charger would not be getting yanked about all the time. In a moment of serendipity, the original power switch I added back in ended up being close to the original mounting so mount it back I did.

This shot also shows the speaker squeezed into the battery compartment. I drilled some holes in the back shell to let the feabile sound from the unamplified 3.3V PWM output of the sound module.