Here's the Rapido CN Dash 8 40CM I put a module in. I used a TCS 3.5" 21 to 9 pin harness and ran the speaker wires up the side of the circuit board in the fuel tank to 2 iPhone 4S speakers which Rapido have clips for inside the body.
The downside is that the cover for the fuel tank won't fit back on in it's current form. I'm planning to modify the catch to reduce its depth. As of now the module just sits on the ledge inside the tank.
attached is a couple of photos of the LM3S in the fuel tank.