Cheers man, hopefully have it done soon, I tend to take too long thinking about different ideas and waiting for parts/inspiration but I'm happy with how it looks just need to make it go now.
I think I have fixed the erratic idle now too, the engine vibration would move the slide up an down in the carb making it rev/stall when you didn't want to so I put a spring from a bic pen on top of the slide (I assume there is supposed to be one, there is a hole it sits in, the old duffer who owned must have taken it apart and lost a few bits) and that now holds it in the position you set it at with the throttle.