When you have finished drilling holes in the stock FF chassis and everything is working as you like, send the chassis plate to the blokes at Highpath and get them to cnc you a brand spanking shiny new one made from something a bit more durable than the stock CEN ali. That is a big flywheel hole and a very powerful engine, could be a bad mix for such a soft metal! The centre diff is looking brilliant though mate, stick a patent on it and sell it back to CEN!!