Hrm. I have heard people refer to the aft cabin part of a Catalina 30, Catalina 34, and Catalina 36 as the Garage or Trunk. I tend to use mine as a trunk as well. I agree with sleeping in the V-berth, that is where I would be.
I lived on my Catalina 30 for a few months when I was going through a divorce. It is do-able but a bit cramped. I am still trying out how to tackle the winter in the area I live (biggest problem will be getting fresh water) and my marina doesn't have showers or other facilities (especially in the winter when they close the bathroom). If I can figure out these issues, I may go to a bigger boat and become a live-aboard myself
One thing that I did notice is that when I lived aboard I tended to sail the boat a lot less. That is one thing that botheres me about the idea.