Double-check my braking plan

[derekf]

Brakes, like so many things on my car, have been up in the air for a long time and a lot of ideas have sounded like the 'proper' way to go. Unfortunately, I don't remember what went with what and why item A was a better idea than item B at the time.

What I've got right now:
Tall (B-body) spindles
Joe's C5 front caliper brackets
93-97 Camaro/C4 rear caliper brackets



The plan:
C5 front calipers (2 40mm pistons) on C5 13" rotor
C4/93-97 Camaro rear calipers (1 40.8781mm piston) on Camaro 11.6" rotors.
15/16" bore master cylinder

Now, I remember reading that the rear piston should be ~60% of the size of the front (but I can't find where I read that so it may be my imagination) and in my searching this morning I found a post that said that the rear piston area should be no more than 50% of the front.

If I break out my rusty math skills, I get 2512mm area for the fronts
(40mm diameter = 20mm radius; 20mm^2 * pi -> 1256mm, *2 for 2 pistons -> 2512mm)
and 1311.75mm for the rear
(40.8781mm = 20.439mm radius; 20.439mm^2 *pi = 1311.75mm)
which would appear to leave the rears at 52% of the fronts.

If y'all would, please a) doublecheck my math, and b) doublecheck my thought process - it's not too late to change directions on this so long as I haven't bought anything expensive.