Good stuff man, sensible decision. I would never have picked you as being so young from our interactions on here, maybe it's the complete sentences and punctuation?
IMO, a big tank at that age isn't really a great idea anhyway, you've got your whole life ahead of you. I've set up and sold numerous "big" tanks before now, and to me this (at age 32, in my second house, somewhere I want to live for a long time) feels like the first time I'll really be able to keep it for any great length of time and enjoy it. You can have a heck of a lot of fun and keep a whole lot of really interesting fish in "smaller" tanks that don't need the floors reinforced, and don't double your electricity bill, and don't take up half you house/garage, etc etc.
I seem to recall you being into plecs and bottom dwellers? If I were in your situation I'd look at getting a glass tank made around 4-5' long, 2-2.5' wide, and maybe only 16-18" tall, chuck a couple of good canister filters on it, and you'll have a good footprint to play with without too much weight or water. Big DIY are awesome, but there's a time and a place. It sounds like you have some serious (and interesting) studies coming up, and it could involve some sort of travel/field trips (guessing?). Save the massive tanks for when you're settled in a good job and living somewhere you plan to spend a good portion of your life.