I look at this vessel as a trawler catamaran....just a faster trawler. It has some elements of a tug boat look to it as well.
The MOST important thing it has is shallow draft. I believe you will likely limit yourself for the firat 5 years to an operating area that will include the easy coast of the USA and the Bahama Islands. Shallow draft will be important !! It will allow to to explore a much greater area. It will allow you anchor out in areas not reachable by a great many other boats. It will allow for possible much fewer mishaps with prop and shaft mishaps which can become quite expensive. just to name a few.
The twin engines widely spaced apart will making handling the vessel a breeze. The relatively small size of these engines will make for a good fuel economy, and will be relatively easy on repair bills should they become neccessary.
The potential greater speed of this vessel could also be an asset with the youger generation. I've had several older displacement speed trawler owners tell me that it is difficult to get their grandkids to come for a visit/cruise on their too-slow old boats.
I don't understand your comment about the deck area of the catamaram? For a given length the catamaran generally possesses the greater outdoor deck space than does the monohull vessel. The photos I have of this 62' cat don't do justice to that BIG aft deck area.
Notice that in this first photo there is an awning material that is rolled up along the railing ready to stretch out over that aft deck area.
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That big aft deck becomes an outdoor salon and galley. A lot of the cooking and eating can be done out there, thus keeping ther interior free of cooking odors, cooking heat, and the condensation associated with cooking gases.
That big deck area is just waiting for creative applications from diving preps, to jet-ski operations, etc, etc.