Hey drop. You might want to take a look at Living Aboard Forums • Index page
There's quite a few trawler owners that liveaboard and post on that site. They may have some insight and tips.
I think in general though, you tend to see people liveaboarding in the 30-50ft boat range. As the size of the boat goes up, costs increase dramatically and they get harder to handle. And boats in the 40-50 range usually already have plenty of space to meet most people's needs and still be able to be managed by 1 or 2 people.