I recorded and uploaded a couple of GPS traces. Based on those it looks like the geometry you've added is pretty accurate!
Having a drone like yours for some photos of new features like this seems really useful! I worked for a little bit on georeferencing them but couldn't see a clean way to get it into josm or iD. Perhaps that'd be a good idea for a side project for me sometime.
Anyway, feel free to reopen this if you feel like there's more to improve or discuss. I'll close it for now if not!