I think that you should just forget these tank, its not going to cost 2500 dollars, and you cannot make everything except the lights, you cant "make" the pump, the heater or the lights, you may be able to modify them but you cant do it from scratch.
CFC makes a very good point, its just not going to be feasible, esp on a "$2500 grand total" budget...
I would point you to a good shark and ray keeping forum, but its not aloud and I wouldnt like you pestering them like you have us, its just getting stupid now...
Face the fact that at 13, you wont be able to have these monsters for a good while yet, I had to face it a year or so ago, and I was older than you, but now I can see that the tanks aint gonna get much bigger, for now. Please let it slip.
One thing you could do, which I really do think is possible for you, would either be an outside pong of arround 1500g with gars, channel cats and other larger bits and bobs that can take abit of cold (depening on where you are) or and indoor FW one of about 600g or so with other things.