Hi Robin, Yes, the chassis isn't too bad, just surface rust and flaking paint at the rear end really. I will find out more once it has been steam cleaned. I took a close-up of the rear end of the chassis as I was taking it apart and it looks like this:
Yes the engine and gearbox are moved back to improve the balance of the car. I hadn't heard of swapping the turrets before though.
Cheers, Paul