Fishy,

a couple of our local members are acrylic fabricators and can build you a nice overflow box and sump/refugium. Dan even sells to most of the LFS's in the area. I would definately suggest either him or Pete, as they can customize the product to your needs and current stand and tank. Definately come by CB pets for some liverock, join maast first and you will save money at most of the LFS's.