Dave,
That is almost what we have now
. Turns out early detection might be our saving grace. So far, it is holding up, even though we discovered the problem 24 hours away from home. The floor would not have deflected yet, but we saw the slightest movement when that piece of plywood wasn't sitting flat.
Sam Caylor will take care of it next week. Overall, things could be a lot worse.
Thanks,
John