box help

[ramman606]

I have four sundown e8v5s on a crescendo bc 3500 amp I was thinking of building a new box all the subs facing up and a slot port in the back 36'' wide 12'' tall 20'' deep with a 5'' wide x 11'' tall and 37'' long port but I was gonna put the port in the middle of the box so it would be 5'' wide 11'' tall and each side 18.5 deep does that sound about right with that much power