Interesting on the 100m horizontal thing.
That's the exact same distance, except 300 feet, that is in the preliminary Huntington Beach, CA ordinance too that is tabled for a later discussion. They lawyer in that one said "If he takes off in his yard, he'd have to get approval from all neighbors within the 300 feet and if one says 'No,' he cannot fly." I didn't catch the vertical part in the HB ordinance, but with all the privacy stuff, I'd think they'd want the lower AGL higher as being under 100' will cause more to get miffed about the things flying over which will lead to more complaints and more restrictions.