OK... here's the piston orientation breakdown:
This picture shows the drivers side inner caliper 1/2. The rotor will be traveling in the direction of the arrow. Position it as such but, make sure it's the drivers side caliper 1/2. The bleeder will be at the top:
Click to view attachmentHere's the passengers side:
Click to view attachmentUnderstand this principle and apply it to the outer 1/2's. Then make sure you mate the proper pairs together.
I see another potential problem. Nice red paint (poser)
In all seriousness, The area where the pads sit; it looks as though you guys did a great job cleaning these up and blasting them. Is that area protected? If that is simply bare metal then it will rust overnight. This is where your pads will sit. They will eventually rust in place, stick and squeal. That area needs to "really" be protected if it's not. I say really because it can get hot in there. Paint will flake etc...