Besides the spindle caliper bracket what else would be needed? Or is it just a simple swap bracket swap and rotors/calipers?

I remember reading over on LS1tech guys swapping ctsv calipers directly onto their factory spindles using the c6 zo6 14" rotors. If that's the case, then all you'd need would be 14" rotors and the calipers because you could reuse the adapter bracket (if you already have LS1 brakes.)

Yep I saw that. I might just buy a rotor to test fit this week to test fit.

Just the caliper and rotors. I tired it with my CTS-V setup

You'll have to grind a rib on the CTS-V caliper to clear the LS1 bracket