Repair or scrap / break

I don't have any diagrams for you but my understanding is that the body bolts are held captive in a kind of double skin box type structure that I think is unavailable as a separate part possibly and needs to be custom repaired/replaced. I've not done it myself this is only what I have read in here.

These posts ( after a search on rust) suggest that we might have to approach the repair by cutting a hole through the floor from above

My Jimny so far, from Rust heap to less rusty heap...

Another green laser build  and a later  Page

Ulysses

Suzuki Jimny Falconer Edition

Project Rust Bucket

Re:My 01 Jimny, another Norwegian

Rust protection

Not quite the Jimny you have, but a previous generation although the concept is the same.

First the top inside layer is removed
 
Then a hole is opened up to reveal the mount

 

Then plating is added
 
 

Then the hole is patched up

And the original top panel is fitted back
 
   

And then its gone!

Thanks Martin