I have a Homebox S with a height of 54" it is a little cramped in there. I have an 12" high top drip hydro set up, 400 watt HPS/MH w/442 inline fan exhausting into my closet attic. My temps range from 70-77 during the day. I make sure I am using short to medium height plants (right now I am in the third week of veg w/2 Lowlife fem White Russians (which avg. 14-18"), and 5 Lowlife fem AK 47s which should be okay!
I have another tent in my closet that I have a mother Seedism BLZ Bud plant and a rapid rooter tray for seedlings. I am going to take clones after I harvest my autos, an I know the BLZ Bud is not a tall plant, either. That is what I look for when I buy seeds-tall sativas are out!
I hope this gives you some ideas on your height worries. Good luck on your grow! protopipe1