Hey excited to see the progress on this build. As far as brakes go Little Shop Mfg. has a big brake kit composed of Wilwood parts that they offer
http://www.littleshopmfg.com/big-disc-brakes/
but if Baer is going to offer something as well then that's great! The more the merrier!
standard brake upgrades and rear disc brake conversions are readily available for these trucks