I thought I'd put a quick update on.
The body panels are now all bonded on and I'm working my way through the masses of filling and fibreglassing.
I've done the front end as a removable, in one piece item....seems to work very well. This is all fibreglassed on the back to give strength.
I've also fibreglassed the whole of the a pillar and metal roof to hopefully stop any cracking.
I'll take some pictures tomorrow as I broke the camera on my old phone, but the new phone is here now.