need held on my first build for a fi bl 15

[fibl15]

i need to make a box for my fi bl 15 with cooling and 3" voice coils. the box has to be 6.3 cubic feet tuned to 35 hz . i want to have two aero ports in back of box and the sub to be on the front in the center. im horrible when it comes to doing all the calculations so can someone give me the dimensions of the box and the ports . also the box cant be no more than 35" wide and 21" in height . i will be powering it off a 1000 watt hifonics amp. can someone please get back to me with the dimensions for this box so i can get started asap