Interesting stocking and this will be a neat project to follow!
For right now, I'd recommend NOT having any spawning habitat in there for the CC. You can always put it in later, but for now I think it'd be better if you didn't have them reproducing in the pond - just so you can keep an eye on the other species without a commonly and easily available species getting out of hand.
Do/will the Sac Perch prey upon the CC? How large of a CC can they eat? That is my main concern about the habitat in there for the CC to reproduce. CC are the 2nd smartest fish in North America, and if only a few keep avoiding being caught, you can easily have CC in there that can eat any of the fish that reproduce in the pond. The CC turn piscivorous around 3# in size, and if there aren't enough predators in there to control them, they may become a problem.
Will you have plenty of spawning habitat in there for the Sac Perch?
I have CC reproducing some in my pond, I dumped several loads of commercial water main pipe in there, from 6" dia up to 16" dia, cut in 4' or less lengths. some must have landed in a way to let them spawn, I am regretting that I have created a spawning site for them.
