Just a helpful suggestion, but a lot of recent craft (including those of the USCG) have a stern ramp to drive the RHIB up. It is my understanding that this allows for both faster launch and recovery. Pictures of what I am talking about can be found
here,
here, and
here (the same type of system is used on the
Sentinel Class Cutter, which is smaller than this craft so size isn't an issue). That being said, the system you have works, and even with a stern ramp, I'd keep the crane.
I might also add a few more machine gun mounts, and a life ring to two.
As for labeling, you use the B-Side to list off what you have listed here.
As a minor aside, the standard font is Arial.
Let me make sure I am clear - you've got a good design here, and is a good start.