Dual sundown sa15 box

I need help with building a box for 2 Sundown SA-15 D4 V3 subwoofers, they will be powered by a Sundown SCV-2000 amp, ill have a 220 amp alternator that peaks at 1200 rpm, and an extra battery. Im hoping for a 32 hz tune and My trunk space is 30X45X40, im willing to give all of it up for the perfect box. I will be building it myself, so i just need help with the exact dimensions/design. Thanks in advance for any help!