closet contruction help plz.

Hi i'm a new grower and i want to do two separate chambers for flowering and veg in my closet. width 67'', depth 24 1/2'', and height 98''. how should i divide the height. I know the flowering room should be bigger than a the veg. i am planning on growing with t5 fixtures in veg and having 2 400 watt hps' in the flowering room.
 
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