New Grow Room needs some fine tunin

First of the year will be doing my first grow a auto-flower grow in my closet. Closet is 2-feet wide 6-feet long and 5-feet high(i know its short but the room is in a finished attic with sloped ceiling). My plan was to have about 8 to 10 plants under a aircooled 600w hps with 2 4in inline fans with one blowing in air and the other pulling air through the carbon filter and cool tube and exhausting it into the attic space. My question would be would any of you change this design in any way. also I have about 4 months left on my lease hence why I am using auto flowering plants. Any input would be very helpful.
 
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