Finally able to update this thread, its been a busy summer racing my present car and away with my son racing his kart, so I've not been able to do as much on the new car as I would have liked but now its moving forward.
Earlier this year I was able to make a good start on the under bonnet welding, there was a poor patch welded to near side inner wing so I removed that and welded in much better version.

I was then able to get the car on the spit ready to start underneath starting with the offside sill
Taking the outer sill off revealed a mess!
Soon had it all cut out and new metal welded in along with the sill to floor join which needed new metal for the full length of the floor.
Then I welded on a complete out sill
This week I've started on the rest of the offside floor.
That's where it stands at the moment
Steve