appears to be more seaworthy than the new boats. I have been boating for over 50 years, and I have driven/ride more boats than you can imagine in all kinds of weather.
The old wooden hulls ride storms far better than the new boats. Old fibreglas hulls are better than new. The deep-Vee hulls are the way to go in large lakes such as Winnipesaukee. They can ride out a very bad chop much better than the semi-vee or flat bottom boats.
Most new boats on the market are semi-vee and do not handle heavy chops well. My old 4-winns Liberator was a far better riding boat than a new 4-winns Horizon. Even at the same length. (21')
I would not trust a boat under 21' on the Broads any day. It appears to be too small to handle large chops.
That being said. A boat not only have to be built well, the hull should fit the worst conditions of a particular lake.
Most boats I have seen on lake Winnipesaukee are not design for the rough waters on Lake Winnipesaukee.