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This is the thick metal sheet that fits inside the dome. The shape was created using a paper template and allows for the wings to be attached to the dome without interruption. The hole in the center of the metal was a pain to get to its current state. I first had to drill through the sheet using increasing bit sizes. This was time consuming due to a coat of something, I'm assuming plastic, on the surface of the sheet metal and the thickness of the sheet metal itself. Following the drilling, a jigsaw with a metal cutting blade was used to slowly cut away at the metal. The cut could not be made in one pass because of the tight curve of the circle. I had to chip away at the circle one cut at a time. This too slowed me down. As I moved along the circle, chipping away one piece at time, the cuts began to be more and more difficult to complete. I finally stopped with my circle being about half a centimeter smaller than needed. The only solution was to file out the circle to the correct size. The hole took a little over two hours to cut out, but it fits perctly around the pipe that is to be placed into it.
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Here is the hole cut through the bottom of the dome.
This is the final outcome of the day with the pipe containing the originally intended bend.
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