Ok so what I did was take a set of old, USB powered speakers, and then extracted all the guts out of the original casing. Some modifications were made to the car to fit the speakers and its guts, but it didn't change the appearance (except for the addition of stronger and multiple LED lights.
I put the speakers at the front lid and back trunk, so when it's closed, it just looks like another one of those model cars. But when you open the lid and trunk, speakers pop out of nowhere! Cool eh?
I also rewired the LED so it would reach the bottom of the car, and I added a couple more LEDs (in series, I think) to give it a nice underglow look. It also serves a purpose, as it turns on when I turn on the speakers so I know that it actually works.
I had some problems trying to get everything to fit, and while doing that I broke a few wire connections and the original LED. However, with the help of trial and error, and a whole lot of patience, time, but mostly hot glue, it turned out in the end.
Thoughts and ideas to make it better? Thanks for looking!