I had a look in my sills with a boroscope/endoscope last month.
The car appears rust free, with no rot evident, but you can never tell till you get inside can you?

Certainly when I poked around inside the bulkhead void it looked good.
I purchased on of these camera from ebay for £15 and strapped it to some brake pipe.


I drilled a 10.5mm hole and went for it.
These are the results. You may have more of an idea what is going on in there than I do. Looks a bit spooky. Bit like the film Alien.







I appreciate I shall not be winning any photography prizes. To get an image on the laptop you have to be a inch away and steering it from the rear wheelarch is tricky, I know how those guys taking pictures of the Titanic from an ROV feel now.
I could get from one end to the other.
Then I cleaned the area of the hole, sprayed a bit of satin black on and inserted a grommet.
Certainly the sills have always felt strong from a jacking point of view.
I feel some waxing coming on (after the paint).






