Thanks for all the general pointers, but does anyone know...
1. if I'd have to let Chinese authorities know of my presence? (for example, do private yachts have to announce 24h in advance to mainland authorities?)
2. where to moor in Macau? (for example, where do private yachts go?)
I was also thinking of doing it in reverse... Leaving MO without going through immigration, passing through CN, re-entering HK as HKPR and not caring about formalities... or as is the official terminology here "entering by my own means...".
Thanks for highlighting the hydrofoil issue. It's certainly a problem, but I plan on checking their schedules. I would not have too much interaction with as I'd hope to leave from Tai O, following the bridge. I'd be well away from the HK-MO ferries until the very end and would be running perpendicular to other CN ferries that follow "roads" on the sea.
Why? I would like to this once as a bucket list item. It's just one of those things. Like Mac100 and I have previously cycled all around HK in one day. (HKI-Kowloon-NT-Lantau, costal with ferries). Not about speed, time or racing - just getting it done.
I do appreciate your concern for my safety re. hydrofoils, but if you have knowledge on immigration aspects I'd appreciate that.