I repaired my inner wings.......
Its important to get the height of the inner wing correct if replaced as once welded on, it's very difficult to move. Whilst the shock absorber mounting holes will help you, there will be some movement. 2mm at the shock absorber mounting point could result in 10mm at the front of the inner wing causing gap problems to the hood. I also decided you can only cut so much out before running into problems. My front fenders were cut off the same as yours and their isn't much left to align to. Most panels have to be made to fit and cutting too much out can be a recipie for hassles later down the line.
This is what I did.
Post #135
http://www.theminifo...-rebuild/page-9
As you can see I cut the rotten metal out behind the shock mount. There are also stiffeners welded inside the inner wing.
I worked on the LH inner and outer sill, the inner wing and the flitch panel all at the same time
http://www.theminifo...rebuild/page-12
It looked like this when done

GraemeC is absolutely right about the shock absorber mounts. Have a look on the inside of the inner wing and you can see that it bolts through the cross member that runs along the bulkhead.
Hope that helps you
Pete