I am going to use plastic acrylic ball halves (used for making christmas ornaments) and they are clear they come in 2 three and 4 inch sizes. you can get them at Joanns craft store. Kind of a woman's store,, just do a quick scan of the area so your friends won't see you going in... You know,,,, The balls are clear and so you can pain them from the inside and make port hole looking windows and also can use a camera. what makes a neat window for the front ( I am building a non scale research sub). I hope I helped a little.. I love the fiberglass idea too. i am going to use that for something else.. TOm