How big is the whole room?
Perpetual grows are alright but they need a lot of time and effort, and you need an extra res for flower because your running 2 stages of flower.
I would make a decision on dirt or hydro. Hydro is nice because you can eliminate a huge source of bugs and pests, which is the biggest downfall of growing in dirt. But dirt has the advantage of needing a lot less work, and its much cheaper to get up and running.
A well designed hydro system can be easily automated, But you need a huge start up budget.
If I were you, I would consider just polying out the whole room. Use that cab for veg, put a 250w MH in the cab, and put 2 x 600/1000w HPS on 4-6ft light rails in the main room. Put them both in cooltubes, it would be way easier to manage your temp and humidity with one big area to flower and a cab to veg.
If you own the place I would box the window (if there is one) and use it for exhaust, I would build a nice box over the window, put a black curtain in the back and regular curtains in the front, and put some cheap white christmas lights at the top, or any LED light, and just flick it them once in a while.
Once you have a nice space all set up properly then the easiest thing to do would be a dirt grow. A good tip is to get an old Deep Freezer, a big one, and freeze all your dirt/soil for minimum 4 days before using it. It will kill any bugs or larvae that might be lurking in the soil.
If you can get Promix or Sunshine mix or any soil from a reputable source you should be fine.
Even if you just use that cab you have right now. I would grow some nice big mothers that are confirmed female, take like 30-40 clones, then fill up some 3 gal pots, 12-16, see how many fit in there with out cramming them in, and do a nice simple grow.
Bit of a tip, Even if you manually move your light every few days it will help a Lot. Hang it 6-8 inches to one side, then move it 6-8 inches the other way every few days, you could increase your yields without having to buy and install a light rail.
If you havent already, you need to get some confirmed Female clones or a mother and keep her in veg. Once you have some confirmed female genetics you can kill all the males and any your unsure about and move on with peace of mind.
You got a nice little space there, You could be growing some Killer buds.