Plenty of height at the northern end, which is where the channel is, the problem is depth under the keel a little further on
As far as the buoys go, yellow is private, red is commercial or club and pink is public. There are no public moorings in Gunnamatta.
If you get further up into south west arm you will find four club moorings at the end, grab one, everyone else does.
Have a good one. Bob.