Here is a rough sketch of my plans for the sump (dimensions are approximate). I would like to plumb the overflow from the tank into the skimmer box, and then connect it to the diffudsion plate.
A single reactor will be used for calcium, however, I'm still undecided on the other two. I'm thinking of using one for GFO and the other for Sulpher. I'll try to add some plumbing to the sketchup to give a better picture of how things will be connected.