Wow - a 3 hour meditation and not even touching the financial segment yet, talk about chinese water torture! I do hope today's session goes well for you. Stand firm on your bottomline and don't let your H even get a whiff of weakness on your part. I would hope that if he knows you are serious about this being your final number he will be more apt to settle rather than have it dragged in front of a judge.
As for your question regarding the drop-off location for your son. the only thing I can think of as a good argument is that having a third party involved provides you a "witness" should there be any conflicts or disagreements that arise.