18 inch solox sub box

What would be a resonable price for a sub box for my kicker? i am putting it in my 1969 dodge charger and the depth of the trunk is only 17 in. about 4.5ft. long and about 5 ft. wide. the sub is going to have to be slanted to fit. it needs to be 6 cu.ft. not including the sub displacement according to the kicker manual specs. what would be the dimension that i should use and the price if built by a local shop?

If the angled baffle is deterring you from trying to build this box, here's a tip on figuring out how to find the slant side length and the angle cuts:

Working your design out on paper, draw a right triangle where the slanted baffle is the hypotenuse.

Use this calculator:  http://www.1728.com/pythgorn.htm

The straight sides of the right triangle are sides 1 and 2; the angled side is the hypotenuse.  The calculator will give you the length of the hypotenuse and the cut angles for that slanted side.

For calculating box volume, keep your diagram broken down in this way.  All of the box volume except for that triangle is calculated as straightforward W X L X H volume, and the right triangle can be figured as W X L X H divided in half.