Truth is I found a 36 cm (14.2 inch) buoy on the beach that is just perfect for modeling this at 1/25th scale, so I will have to model it. And since I will be testing a model of this design I decided to write it up to match the model. :-) The idea is growing on me the longer I think about it. Vincecate 03:35, 10 July 2008 (UTC)
How about making the sphere by spraying fibrous concrete (shotcrete) on an inflated balloon?