Anyone know what kind of wood I should use, or can I just get some plexiglass and screw that to my rear seats and add my 4 ch. amp to that, or what. I need pictures and ideas, and a lot of help. Thanks

 

Type of wood: 1/2" MDF works well and is cheap.
Some plexiglass: What? Where would you put the plexiglass? Directly on the seat? Why? I think the first thing you should do is draw (on paper) what you think you want to create. Then you can get a better idea of what you actually want to accomplish.