I stumbled into a pair of S550 Brembo takeoffs for a song and that got this ball rolling. I think you can normally find them for $400 or so. These were basically brand new takeoffs that had a few installation chips. Junkyard knuckles allowed me to do all of this while keeping the car on the road. Here's the rundown and the pictures.

Parts List:
OEM '03+ knuckles modified for Mustang brakes
2013 G500 rotor with center bore enlarged .026"
2015+ OEM Brembo Calipers
StopTech 950-61003 Brake Hoses (a buddy had these on the shelf so they were free and likely there are better options)
Dorman 13940 Banjo Bolts

The coolest part of this is you can use any OEM or aftermarket mustang brake package that uses the S197 rotor offset.