As you can see, rust wise, we're in decent shape. The floor pan only has a few spots. You're looking at where the battery usually sits. The dark spots are rust holes.
But the heater channel is looking a little ragged.
And the support rails are showing a very unusual rust pattern.
You're looking underneath the car at the rail that runs under the door. Rust should be going from the bottom up. I suspect that water came off the convertible roof and pooled inside the heater channel, eventually rusting out and making it's way to the support rail.
We'll time to replace. Stay tuned!