Need help with box

[Jupi]

I'm brand new to building boxes, but i have some woodworking skills and really want to build my own box. (sealed)

I'm sending 1500 watts to 2 P3D2-12 subs.

I dont really have any limitations to the size. (48 inch wide and 3 foot high limits. but it wont be that big)

I drive a 2000 Tahoe Limited and i want the subs to fire towards the ceiling.

So, my question is; is there a website where i can put in my specifications and they give me blueprints (for free)

ANY HELP THANKS!!