If you are buying the glazing and you want opening windows you could look at deck hatches. They have seals, theyre strong, and they have gas struts and flyscreens.Trapezoid shapes are over A$1k each, while the cheaper Lewmar square frame hatches are around A$300. For another compromise it is also possible to set a smaller opening port light into a fixed window.

As an aesthetic feature windows will absolutely make or break the look of a boat, so they need the most careful consideration. Traditionally cat builders have used fixed plexiglass behind apertures cut into the deckhouse as this is about the cheapest method.

Prouts used tints all round set into a blue band around the sides of the deckhouse to reduce the height of the cabin, while the shapes of the apertures were sympathetic to the pilot house ventilation was with deck hatches on the roof. Thats about the cheapest way to go

Nowadays the bigger Lagoons have added bulkier cabin roofs with peaks and raised shoulders which gives so much additional height they can afford putting a cockpit inside it! They use regular opening deck hatches dispersed among the windows for ventilation. But it does mean their opening windows are 'x' high because thats what hatches are, when something not quite so tall might prove just as useful and avoids the block of flats look.

Consider too that there are so many of these things in charter use, they have had to capacity to research their designs to optimise the balance between light, ventilation and visibility while keeping a family 'look' to their boats, much as Prouts did.

If for example the collective of windows can be lined up as a window strake which is set into the cabin side some 6" so it appears to have some shoulder above and below it which reduces the apparent height, adds framing strength and limits the weight and cost of glazing. It does make a more complicated build, but sometimes thats the difference in an engineered solution.