New clutch arm has arrived! Hurrah!
This is now fitted to the car and the rebuild work commences. I only spent a hour in the garage but I had a couple of thoughts of how I'd achieve some previously difficult problems. The top of the tunnel trimming can be finished off by dressing the tunnel side tops around the chassis tubes. Better to actually show before and after pictures when it's done.
The battery box/cradle problem could be solved as well with battery box design version 4.
I've simplified the aeroscreen fitting as well. I'm going to use the side mirror mounts as fixings and tension it around the scuttle. A strip of the self adhesive foam stuck along the underside of the leading edge will also address any variations in the gap.