Watchtower part 1

I have always wanted to make a shallow dome roofed watchtower of some sort and over the years scribbled many thumbnails of the sort of thing I had in mind. Until now I had never found a suitable large shallow dome... then one suddenly appeared ouit of the blue, part of a microphone shield that had been removed at work. The thick acrylic blow moulded shallow dome with a diameter of 695mm ( 27") was…