Make sure the salt cell is at least 2 x the volume of your pool.
I hope that you are getting a VS or at least a 2 speed pump, as when you have a saltwater pool you have to run the pump long enough to generate the amount of chlorine your pool needs. This can be expensive with a single speed pump.
While they look nice, I am not a personal fan of free-form pools as they take away the amount of free space for swim lanes. But, many people have them and love them..
I would make sure that the pool has 4 returns.. Basically, one on each "wall" of the pool.
I also like the idea of having two skimmers, unless you are going to have a screen-room..