need help on 4 12" box design

[j1263b]

i am going to get 4 12" http://www.sonicelectronix.com/item_8341.html those would go into a 2001 land cruiser. i need a box design. im considering buying a box from caraudiofactory.com but i hear alot of prefab boxes dont sound good at all. the dimensions are

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[jeepintn 10+ year member]

there are a lot of very good designers here who can design you a box for that space that will work VERY well, but it usually costs a small amount of money. if ur willing to pay a little, pm me and ill be happy to do it for you.