You are off to a great start. Love the rock. Cant wait to see it full of life.
Yes it is elaborate compared to what the average person has. However it is not that far what I'm running. Basicly a main 120 gallon upstairs in our sun room, with three 40 gallon propogation tanks down stairs, and a 100 gallon rubbermade refugium. I did this set up about 4 years and now I'm looking at ways of improving it. Your rubbermade covers sound like a fantastic idea.
I just found this site today and have just started getting into the hobby a few months ago. Anyways cool build and I realized you live down the street from me.
I have some white Styrofoam in the shop but it is in smaller sections would there be a problem if I tapped that up with duct tape into the size I need?