Little background first so I don't get flamed for the products used (including the particle board)
My brother is a wrecking yard owner so 90% of what you see came from cars from his yard.
The three JL audio 12's, the larger Kenwood amp and the JL audio amp, in the passenger side rear quarter panel where the factory 8" and amps would be, came from a 90's model Honda.
The story goes that a lady in her 80's came in and asked my brother if he would be the car from her, he offered her something like $250 and she said perfect. As she was hobbling out on her cain, she said over her shoulder "by the way, there is about 2K worth of stereo equipment too". My brother didn't think anything of it until they pulled the car in to start tearing it down.
As soon as he saw the speakers, he sent pictures to my (at the time) 17 year old niece. And don't even ask for pictures of her.
The group of pictures will explain the rest of the story better then I could. We have maybe $200 in the whole build less any beer that was consumed.