my opinion, is that you should do atleast 4... i mean like i told my buddy, doing one or TWO isnt really worth the effort,time,expenses,heating bills. etc.. but i mean if you have enough room do it up! but if thats all you think you can fit maybe you can use smaller pots and maximize your space.. other than that its a good setup.. fan might have to be moved out a bit but it seems ok for a diagram

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