I recall that it had 3 cabins, so you should do ok. I for one, will really be tuned to your comments after driving it as it is the one I'd like to charter next visit after having the larger 474.
I will make one suggestion: Regardless of what the brochure says about top speed, you will probably find the engines governed to a somewhat lower rpm than a new boat would have.
That said, remember that with a powercat, you pretty much point to where you want to go and shortly afterwards will arrive there. No worries about wind direction unless it is really blowing head on.
So, try running your boat at 8 to 9 knots like we did with the 474. At the end of our trip, we used only about $330 worth of diesel including for the generator. The boat will run alot quieter and you will feel less propeller vibration.
Push it up to max or close to max cruise and you will be looking at a lot more fuel.
And none of the distances in the BVI are particularly long; 25 miles max.
Keep us posted!