adding material to section, making taller and long

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I am about to take possession of a pilot house boat. The pilot house is shorter (height and length) than I would like. I want to cut the top vertically near the back and extended it as well as cut it horizontally and make it taller.

Is this nuts?

I have alot of experience with autos including alot of restoration of Ferraris, and other exotics. I have experience with fiberglass on cars but not on boats. I figure there is going to be alot to learn but I'm sure alot is similar.

I've selected the places to cut where I will not have to worry about dealing with angles (so the top doesn't need to stretch as it is raised). I've chopped tops on cars so I've learned some of the tricks although those were metal.

Is the best way to make a piece of glass then insert it into the ~1.5' hole or raise the top and add the material in wet.

Any advise is appreciated!

mike