About the brakes, here is a link to the video that I watched that lead to look into this further. I have reached out to him off of his facebook page to get more info.
From what I have gathered, he wants $260 for both brackets, front and rear, and it allows all of the available brake options for the 2014 base/GT/GT500 models, including the brembo style.
I went and found the video for the front brakes and it really isn't any different than what I did to put 13" Mustang Cobra rotors and PBR PCD (C5 Vette) calipers on my car. Or what AndyF did to put Viper calipers on stock spindles. Not saying he (or I) copied anyone, not like anyone bought someone else's kit and started producing their brackets based on measurement's taken.
Didn't find any real info on the rear brake swap, so curious to see what kind of response you get.