go to Car Audio Classifieds and talk to ( Zfreritchs ) he designed me a box and gave me the demotions for every piece of wood he charges 10bucks on paypal but in my eyes it was worth it here is what he gave me . Also he designs the box to sub specs
top & bottom
49x21
side
(19 1/2x16 1/2) x2
Back
49x16 1/2
baffles
(20 3/4x16 1/2) x2
Port#1
(15 1/2x16 1/2) x2
port#2
(2 1/8x16 1/2)x2
if home depot can cut 45s
3x16 1/2....................3 being the widest on face