A "narrow" boat might have a 4:1 length/beam ratio, so at 8 feet wide, 32 feet long would be considered a narrow boat. But if you think of a canoe, you can see ratio's upwards of 9:1 on an 18 footer and it's still seaworthy and viable. Most "modern" factory produced boats rarely exceed 28 feet with a 8' 6" beam (3.3:1)
As suggested, a designer or marine engineer may be able to explain if there is a practical length for an 8 foot beam which may have to do with the "usability" of the boat combined with safety and handling issues.
Narrow boats are more "tippy" because they are more sensitive to weight distribution about their center of gravity and bouyancy than a wider boat (all else being equal). Again, think of a canoe - if you stand up in an 18 footer you are likely to go for a swim unless you keep your balance perfect but you could easily stand in a 12 foot rowboat that had a 4 1/2 foot beam even though both may be very close if you measured the total "wetted" surface.
Because of that, while you may get away with putting a dual console on a 25 footer with a 7 foot beam, it probably wouldn't be wise to install a flybridge - the beam just wouldn't support the balance required for the verticle construction - so it probably depends on how you intend to use the boat and what kind of layout you are looking for..
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Graham
Yes, Plywood is "real" wood
A "professional" is someone who gets paid for their work - it doesn't necessarily mean they are good at it
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