I thinking about building a 200gal tank. I am going to go 96 inches long. 20 inches high and 24 inche wide. I already have a 55gal that I will use the glass out of. I keep hearing that it cost alot of money but I came up with a price of around $65-$70 plus the plexy glass that Im going to line eveything in or I might use drylock. I should need 2 sheets of 3/4 plywood, and 13 2x4's . Am I missing something or what?