Can someone tell me if it's only pre made Haynes roadster panels that can be used or can any of the bodywork kits (Westfield particularly) be used. The bodywork is one thing I want to avoid doing myself as I want the finished article to look pucka and think pre formed units are the way to go. Any thoughts?

Not sure about other kits fitting but Westfields do fit with a bit of chopping and filling(not what your after though)- im in the process of doing this..
All the seven shapes are roughly the same size though- so in theory anything can fit! Just watch for the difference between narrow and wide body kits!
Hope this helps, Mark.