big brakes, why not the 2012 Stang GT

If you're going to go that big I'd go with separate hats and rotors. Use drum brake front hubs w/o the drums (obviously) or disc brake hubs with the rotors cut off.

Radial mount and sliding calipers both present design/fab challenges to the home shop guy. Really depends on ingenuity, tools available, and skill-set. I'd be looking at ear type mounts myself, and I used to design brake kits for wilwood. An option that might be worth looking into are late model 4WD Tundra front brake parts. 2WD's are different, the 4WD's use an ear mount, fixed caliper.