Hei, I am building a widebody in Norway, and have put some thinking into the cabin design. First you have to remember that the widebody is not that big and the hull is quite sleek. I will have a shortened cuddy and then a shortened wheelhouse. When I first started the build and saw the dimensions take shape, I was impressed by the size, but now, after the flip and building the cuddy, I am not so impressed any more. Of course, I love the boat, but it is not that big. The most important step was to simulate different solutions for the interior, using cardboard. This said I will try to give you some ideas about what is possible on a widebody:
Cabin size will cost you deck space. Of course, you can build a widebody for traveling and with berths, but then you will not get any decent fishing deck.
Cabin size will change the boats proportions, both it’s looks, but also weight distribution, center of gravity and how it reacts to wind. Once again some arguments to stay reasonable.
And its important to realize how much space you can win by adding some width. So yes, the standard will be much smaller on the inside. And the jumbo is a whole new category.
In my mind the widebody will work fine (and look fine) with a small cabin. I would not go for the standard, even if it is doable. And I doubt that you can build a very comfortable cabin on a boat of this size. The cabin will be more like a small camper van. Lots of multifunctional details crammed into a confined space. I will accept that, but I don’t know how that will fit your needs.
All the Tolmans handle great. But all reports I have red indicate that seaworthiness increases when you move from the standard to the widebody or even bigger. There is no single design detail, but simply a little more width, weight, bigger engine, and so on. Just all these details adding up to make you feel safer.
Good luck Peter