For a liveaboard, a sundeck model will give you the most room for its size.
I have a PT35 Sundeck located in Easthampton, Long Island, New York
which I use mostly to liveaboard during the summers. She has a single 225HP diesel which allows speeds higher then normal trawlers but is still extremly
economical to use. With air conditioning, heat, full size fridge, two heads, two staterooms, generator, gas stove etc. she makes a great liveaboard or cruiser.
Contact me if you are interested in coming aboard. As I now live in Florida,
she may become available for sale.
I surely do agree with Ben...
Regarding: Sun deck is a greatly roomy and relaxing out door fun place to enjoy days/evenings at anchor. Nice during slow cruises in calm waters too.
Must say that I also much prefer a flying bridge for even more room aboard and for most of the time piloting too. Good sized swim platform off the transom is also high up on my list. Wife likes galley in the salon and we both love large salon windows. Those items as well as other "things" make boating a real pleasure. Thus the name age old colloquial-marine term "Pleasure Boating".
Item I'd also like to mention: Twin engines are very nice to have for many reasons. For pleasure boating I believe in planing hulls; semi planing is fine too. I don't particularly like displacement hulls for several reasons regarding general "Pleasure Boating". Displacement hull design is very good for very long range at slow speed with active stabilizers whenever sizable seas come into play. Planing hull with hard chines and enough engine HP to enable available speed capabilities can make a boat work well in many sea conditions. In other words: For long range cruising get a displacement hull boat. For general, relaxing pleasure boating get a planing hull boat.
Now back to the item about single or twins. Each to their own on this. Seeing as planing hull is my preferred choice for a pleasure boat the engine or engines need to have considerable HP capabilities to reach speeds whenever I desire or require.
Here are reasons I "really" like twins:
1. Maneuverability at slow speeds in forward or reverse
2. Capability to walk the boat sideways via correct rudder-angles / throttle placement sand opposing transmission directions
3. Extra reliability - I like redundancy on boats - twin screws / pilot stations / heads / sleeping quarters / props / rudders / compasses... etc
4. Capability to shut one engine down and cruise slowly on the other with minimal fuel usage.
5. Last but not least; for when desired: Sheer power to have the "Pleasure Boat" plane over/through the water at a fast enough clip so that destinations can be reached without taking too much time.
Here's the one thing that [in my opinion] twins do have against them - an increase [basically a doubling] of general maintenance costs and efforts... which for me is surely OK when taking into account the five reasons mentioned above as to why I "really" like twins!
Happy Boat-Choice Daze! - Art
PS: The "[basically a doubling] of general maintenance costs and efforts" [for twins compared to a single engine] is meaning the actual parts/product used on the engines. Time and effort for getting tools ready and then putting them away is the same for twins as for singles. Toting new parts aboard and used parts/oils off is double effort for twins.