Brake Offset For Floater Rear for wheel BS

[CampbellshotrodsAZ]

I'm in the process of finalizing my order for my Billet Specialities Forged wheels, and have one last detail I'm trying to figure out. I'm going to get the Speedway Engineering Grand National floater rear through RSRT, and I guess Speedway hasn't been quick to returning answers. I figured I'd ask if anyone has any actual experience or measurements to help me get a ballpark BS figured out. I'll be running the Grand National floater, and I guess the Wilwood brake package I'll be running won't utilize a traditional rotor hat type assembly, but mount to the floater hub itself, and place the rotor in towards the center of the rearend more? I just would like to know what this offset is around, roughly. I'd like a deep wheel, but I don't want it deep enough to where the brakes end up outside of the wheel entirely, potentially becoming an issue with the wheelwells/suspension! I'm thinking if I could get a rough backspacing to where the brake rotors are just barely inside the wheel, that should give me a good balance of cooling/clearance.

And FYI, wheels will be ordered first, then I'll mock the wheels in the vehicle and finalize the width of the rearend, and get it built.