Large Grow Units

I have been working with fairly small spaces and budgets but now have plenty of both. I am planning to build six free-standing flowering chambers. I want to use metal storage shelving and put two chambers one over the other in a 4'x8' unit with casters. This would give me 12, 4x8 flowering chambers. I plan on using two vented 1000 w sodium lights for each 4x8 chamber. I feel confident I can work in a 4' vertical space having done so already.

First questions:
- Is there a better forum to post these questions?
- Are two 1,000w lights too little for a 4x8 space?
- I picked 4x8 having been in the building trade for years and that is kind of a standard size to work from for most things. Is this a reasonable size for building my flowering units? I cannot find metal shelving in that size but am still looking. I will be bummed out if I have to do 3'x6' or something smaller.
- I plan on putting three of these flowering units end to end with the 8" light vents hooked together. Will this ventilate enough with one, high-powered blower or will I need booster fans or one blower for each unit?
- I have been able (on a small scale) to isloate not only the air to the lights but the air to the grow chambers as well. I am thinking of putting in a normal home HVAC heat pump unit with the compressor outside for providing ventilation/cooling/CO2 to the actual grow area. I can use flexible ducting to connect the HVAC system to the end of each grow unit and then exhaust the air at the top of the unit to return it to the HVAC unit for recooling/circulation. I plan on trying this using thermometers to determine how many chambers I can hook together before the exiting air is too hot. Any comments on this idea? Basically I would have three air systems: the light cooling air, the grow chamber air, and the normal air inside the grow room in general.
 
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