Alright, so my boss finally warming up to the idea of making a wall in his Cavalier for our shop demo car!  Now, this isn't 100% going to happen, but I'm excited and want to be ready for when he decides.  I know this place has a ton of knowledge, plenty and plenty of people who have made walls.  I guess I'm looking for just general rules and/or tips to make sure it will turn out well.  Iv decided just to make a normal, flat and vented wall.  Leaning towards 4 15's with a nice big slot port on the drivers side.  Any tips are welcome of course, thanks guys!

first time, i would try to design a box that you can build outside of the car, and then slide into place, mount it and then make a trim ring to make it look at home...

 

 doing that will help you greatly in knowing how many cubes you have and so forth.

Measure the car before you start figuring what to put in it.

You may find that 4 12"s, or 6 10"s, or 2 18"s would work best.