We have a club member with a West Wight Potter 15 and he was until his age caught up with him the most active sailor in our membership. Our club owns a West Wight Potter 19 which has all the things a 40 footer would have except waterline length, keel, and an inboard. They've done Pacifc crossing.
Back in the early 80's met a guy who'd been living aboard one of these fro a few years, heard on the grapevine he eventuall got down the west coast of Central America, through the canal and up the other side, something like 5-7 years total.
I'm living aboard my catalina 27, and it honestly has all the room you need to live aboard and cruise. I used to own a 3,500 square foot house, and always wondered how I would ever get used to such a smaller place as a sailboat.
You know what? It's easy. You really don't need that much space, nor that many things. Life is simpler now, and I enjoy it so much more!