Awesome, the GH is still all in planning (meaning in my head) as i dont even have a house yet!
Im thinking of making the "vats" out of wood and pond liner, or maybe getting a square 400 gallon water tank and cutting it in half. I'd like to do what you did, but i'm trying to make this project as cost effective and resourceful as i can. More out of cost than anything.
I'm also tossing around the idea of a 200 gallon water tank partially/little more than half burried in the GH for the sump/refugium instead of the traditional acrylic/glass under the "vats" style. If i were to do the water tank, i'd have PVC and eggcrate "cages" to put the LR in to keep it from turning into a detritus trap if i were to simply dump rock into it.
As far as skimmers, i'm also trying to design a DIY multi-skimmer instead of buying one outright, even though buying one would cost probably just as much. I think it would be more fun to build my own and show it off to people

I'm probably going to build my own calcium reactor as well.
Thats correct, i'm Navy. I'm stationed in San Diego, hopefully by this time next year i'll be in WA though. I decided i wanted to build the GH first instead of the house tank, more for learning and then i can fund my dream tank with growing out and fragging.