The bulkhead panel has now been made and it was a bit of a nightmare to bend that large of a panel, I ended up having to clamp it between a 1.5m long bit of 50x50mm box and some angle iron and clamp it in a vice and then go at it with a bit of wood and a hammer.
As I always manage to do with these aluminium panels, I missed with the hammer and it has a nice crease mark in the middle where there was a massive dint, but I'm sure I can find something to cover it up and then if I still aren't happy with it when I have finished the car I will make a new panel.