Well Im Kinda new to this forum, but this thread caught my attention. As I was reading, I thought wow a lot of people with nothing good to say. I didn't read all ten pages so if I repeat what other have said, sorry. You said you have a budget of 25000 in the beginning, and that you wanted to grow in a warehouse that has rooms set it it already. My first question is insulation...do you have any? I don't care how big your grow is or how much you put, trying to grow indoors in an uninsulated building is trouble, you won't be able to control your environment very well, and the constant change of temperature will stress the plants out. Also air conditioning, does the warehouse have it? If so how many units and how many tons? If not you will need to supply those as well, and I found 5-tons per 12 lights ok, but according to my a/c guy, i am making my a/c work a little hard, as he says 2000 watts per every ton of a/c. I ask these questions first as they will dig heavy into your budget. 5-ton a/c plus handler is 1500-1800 plus install and that varies per tech. Plus the electrical work that will need to be done to safely run a grow that large. This part could easy take 6k-8k from your budget from the start. Last thing you want to do is start something that can't be finished, that sucks. I have setup rooms for some time now, and for a 12 light setup, material cost alone ranges 12k-15K depending on the space I am outfitting. My advice is start small, and go somewhat automated, something that big you don't want to spend 3 -4 hours a day watering....much better things to do with your time. of the rooms you spoke of, your veg room seems a little smaller than the flower room, so start there. outfit that one room first, and get it up and running. getting in mind the electric bill will need to be paid for for a period of 3 months, and its gonna cost. After your first or second run, i would advice investing in solar panels. Enough to supply at least 600amps, giving you enough power to run a 50 lamps setup without being on the grid. plus you start saving money in about 6 months. The cost for this is around 12k, also you can sell any left over electricity back to the city depending of where you live. Good luck