Micky1Mo - I'm certainly no expert, but if it was me, I'd make a copy of the Herald based body shell...
Then slice that copy straight down the middle, from nose to tail!
Once either side of the body work at least covered the main frame rails the gap between the two halves could be "bridged".
This should also give you more room in the footwells for the pedals & cover more of the front suspension too.
You would still be left with the overall look of a racing car body, but with a lot less of the hassle.
But what do I know?
Good luck, Paul.
