Share 'Possible to repair sunken top through F-holes?'

Hi, everyone.  A customer has brought a 1940s Gibson L-7 which has a top that is somewhat sunken.  Since it has no pickup hole to work through, I'm wondering if anyone has a process for repairing it by working through the F-holes so that I don't have to remove the back.  I've done a lot of searching and haven't found anything, though I did see an article on Frank Ford's Big Index where he made a…