It's been a while between updates...
A couple of distractions got in the way, but we have still been making progress with #211.
While the LH guard was being worked on, I set about finishing off the firewall because in typical Z fashion where the plenum bottom lip joins the firewall, the firewall had rusted though in various spots:
So my only choice was to unpick the bonnet catch mount and cut a long strip out of the firewall above and below the plenum flange:
The rusty flange was de-rusted, then I made a new patch and welded it in.
It was followed up by linishing the welds smooth and tapping it about to make it straight again.