To get a perfectly accurate joint of the flat parts with a curved surface allows simple reception. Take a sheet of thick paper, such as Whatman; one edge cut into a narrow strip and attach this side to those curves that you want to copy. Drawing in the petals with a pencil or a knife and get them cut lines, and hence a template for marking flat parts.
Recommend to read
STARTS SUBMARINE
For all the apparent simplicity of the hull shape and small number of add-ons to create models of submarines a very difficult job. And yet, the modelers love to Tinker with them: well...
KHARKIV MOTORCYCLES
By the early 1930s, one of the centers of the nascent Soviet motorcycle could be the city of Kharkov. Here in the capital of Soviet Ukraine, on the territory of the former sugar factory...