The Martlet 1 rocket has an HD Go-Pro Hero 2 camera mounted in the nosecone, to take footage during the flight,. A window was needed in the fibreglass wall, so we made first made a mould of the outside of the nosecone outer surface using Siligum.
We then cut a porthole, and filled the porthole from the inside with clear polyester resin. The resin was sanded through the grades of wet-and-dry paper, then polished with Peek. There is very slight distortion, but a good optical clarity. The GoPro camera is mounted on an HDPE block that is connected to the noscone with 3 radial bolts.