Finally got the kit built. It took a lot longer than I thought it would, but it was well worth it. The weather was really bad earlier today, but the driveway was just a tad damp, not wet, so I took it out for its first drive. Even putting around the drive way I can tell this is going to be one fun car. The Savox servo is a bit noisy, but it's FAST. The 5S and 6S Zippy LiPos fit just fine, but the battery wiring is a bit awkward. I might have to shorten the wires on the MMM a bit to keep them away from the spur gear. I did have to shorten the motor wires quite a bit, and I could stand to shorten the white wire a tad more.
The Grid RC mount is super trick. I highly recommend it to anyone looking for an aftermarket motor mount. There's tons of room between the motor and the chassis now.
Good to hear about the Zippy's. What MAH and C rating are they?