Engine bay chassis rail repaired & welded up.
The power went out just as I was going to clean the welds up, so I've packed up for the day (going to be too hot anyway).
I have ordered from Nat0 a new pair of underfloor chassis rails, so they will go on in a few weeks.
I'm now waiting for the paint shop to reopen so I can buy some 'KBS RustSeal' urethane paint, so I can paint the insides of all the cavities.
Stay tuned