This buggy was finished a week ago, but I didn't have time to upload pics then since I was busy preparing for the 1/8 electric race in the JBRL electric series. But here it goes:
Here's an overall view without the battery/battery tray:
I took inspiration for the motor mount from Mike's line of motor mounts, but obviously my design isn't as good. It's completely functional, though!
And now, the revolutionary part of this kit in action:

That's the best place I could find to mount the brake servo. All it is is an upper deck mounted above the center diff/motor mount, that extends toward the rear, and is bent down after the motor mount to keep the CG of the added servo as low as possible.
Then you can see the MMM mounted. There's industrial strength Velcro under it, and a zip tie holds it down securely (although the Velcro alone would allow the MMM to hold the entire weight of the buggy).
And a view showing the not-so-low CG:

With refining it would definitely be possible to get the brake servo and ESC mounted directly on the chassis plate, but I didn't have the time or determination to do so.