hmm. . . i really want to think about this because I want to really give you good solid advice as to the best possible system that you could run for such a big operation.
now keep in mind that i have been and always will be relatively small time in scale. . . unless our government ever got it's head out of it's ass. . . i grow for me and a couple friends and thats the way i like it. so I would value a second opinion from another large scale grower as he might have some insight into what i think is the most important thing.
the question is; what is the best method to grow a large amount of premium grade marijuana, using the least amount of energy, using the least amount of disposable medium, water, nutes, etc, etc. and also of great importance using the least amount of effort.
this is what i have been striving to do for quite some time now, but on a small scale.
so what are your advantages right now?
1)large amount of space.
2)large initial startup capital.
those two things will make your journey much easier and faster to get where you want to go.
ok, so i've been tap dancing around it, so here's what I think (at this time)
light efficiency
the two best methods so far that I have seen to take advantage of the light radiated from a bulb are rotational gardens and vertical gardens. both emit light out from a central point and are surrounded by the plants and are far more efficient than tradition flat gardens.
I was very torn between these two systems when i was shopping to get into a more efficient style of grow. I was torn between the coliseum and the volks/rotogrow. In the end I went with the volks because it was cheaper than the roto, smaller and easier to move/setup in a small area like an apartment. I like it i guess. . . I don't have it down pat yet. after light distribution, i was most intrigued by the effects of "flushing" the auxins through the rotation. i must say so far, about that, i have not seen any positive effect from the rotation. i'll repeat that, none at all from what i can see with my eye. but i do see some negative effects from the rotation, mainly that the fan leaves don't know which way is up. the results in them curling back the fans and twisting the stems. it's not terrible, but I can't imagine it helps with photosynthesis. another downfall in my opinion is the medium. i know it can work great, but IMO RW is not the easiest medium to grow in.
i have never grown vert yet, but that is my plan if I ever get my own house. I have seen some amazing things gone vert. from my knowledge of rotational, i see one main advantage of vert over rotational. in vert, the plants will still want to grow "up", which will be movement parallel with the light source. this means that if you have a 5' diameter in a vert you know your plants will never get closer than 16"-18" to the bulb even if they get a bit too big, they'll just block some of the lower bids of the plant above it.
there is one HUGE disadvantage to both of these methods for you. although you are not worried about plant count for legal reasons, i would be just for workload reasons. both of these methods employ a modified sog strategy to get very even canopies without much deep light penetration. the coliseum and roto can hold hundreds of plants that are really more like individual branches than plants. this means an efficient grow with plenty of bud for less electricity, but at the cost of a lot more work.
the next most efficient type of light distribution i would say is putting an HID on a light rail and letting it move. this is not quite as efficient as the first two, but is the next best thing. i would say you can cover a similar footprint with light mover as a rotational, but in the rotational the plants are all in the sweet spot all the time, and with a light mover it gets short intervals of brighter and dimmer light.
the main advantage of this style for you would be that you could grow 5' monster plants with big colas. this would be a hell of a lot less work than growing thousands of individual branches. you could section off ten different rooms with a 1k hps on a light mover in each room and grow 10-20 monsters in each. not as energy efficient but way more effort efficient.
the least efficient is obviously a flat garden, unless you have the joy of growing under the sun, which is obviously free.
so this was a long post, and it only begins to answer some of the questions you will probably have to answer before you make decisions and get it done.
It really boils down to you, your personality, and how much work you want to do. . . is efficiency worth the extra effort or not? is it better to keep it as simple as possible or to get the most advanced technology? what system offers you the best chance of success, or are you such a good grower it doesn't matter what system you use.
we can talk about specifics if you want, but i just want you to know what your getting into. having help also helps out a lot! so three other people to do the work really lightens the load, so maybe the extra work is not an issue.
btw, I just smoked some bubble hash, and this is the kind of post you can expect out of me right after i smoke. lol. i just keep thinking and my fingers do the rest.