We'll since I appraently got really lucky scoring a fairly clean and mechanically sound Tib GT for less than 4K last time I just decided to bite the bullet and get a beater so I can save some more. So without further adieu I present to you possibly the cheapest (but not the worst strangely) car I have ever driven/owned.....
A 2002 Cavalier Base+ Sedan aka El Burritto Blanco
Now this is possibly the worst sounding radio I have ever heard (even worst than the Tibs and the Preludes) but unlike those 2 it can actually pull in a station that is more that 500 yards away.
the rear seats do fold down so I guess my regular box idea goes out the window but it does have space to make molded FG enclosures so that's a plus.
I'm thinking of doing a false floor and hiding the amp/amps under there with a uncoverable plexi "peep show" panel. Will be ordering the dash kit and harness to install my FH-P5000MP so I can at least get some T/A and EQ on the factory drivers for now.