Thanks guys, but as always it's never easy to play around with these cars
After fiddling around for a while I finally pushed the metal clip (on the bottom) down that was locking the plastic in place. So I couldn't make it slide out until that was bent out. Finding something strong enough to bend it, but thin enough to clear it was such a pain
After stabbing my thumb with a flathead I managed to push it into the tight space and then bend the metal. The plastic slid off nicely after that and the rest was smooth sailing.