This is an older pic, but still pretty much the same (minus mechanical brakes):
http://img.photobucket.com/albums/v1...e/IMG_6071.jpg
The 1/8" thick pieces on the side are kinda like adapter plates, where they were not drawn up on a computer, but the holes in them were drilled using a TVP side as a template. Then other strategically placed holes were drilled with matching tapped holes in the CD/motor mounting pieces. Look at the top 2 button head screws in this pic (on either side of the velcro):
http://img.photobucket.com/albums/v1...e/IMG_8083.jpg
Those screws are just 2 of the ones holding the "adapter" plates to the chassis. Just to the left and down from the left-most of the 2 button head screws you can slightly see a countersunk 4mm screw, this is one of the ones attaching the CD/motor mount plates to the adapter plates. It's hard for me to explain it without adequate pictures, but the design is very simple. Manufacturing is very simple as well, provided you are able to drill 1/8" holes and tap them to 1/4" in 1/4" thick aluminum (with accuracy).
Thanks to your motor layout idea, I'm actually going to completely remake my CD/motor mount pieces so the motor can be positioned at the front and more to the left. Then there will just barely be enough room to fit my batteries inside the TVPs, and that will improve the handling of the truck a lot.