Steamysteam,
Thanks for your reply. What a good work you do with tinplate! It is simple, refined and complex at the same time.
In my case:
Compounding curves is not an easy task and maybe I will not be able to explain it in English. But I will try. Some models, specially the ones of the past thirty years have many curves. So, in my case, the curve is made by beating the tinplate until it gets in the shape I want. Sometimes it needs some litle cuts to make the curve easier. Almost all the times I have to weld the place and get it smooth with a tiny sander/polisher tool. So, the work must be painted to avoid rust.
You will find more of my work in
http://www.oficinaaberta.com.br/fotos/fotos01.asp
Right now I am working in a project that will let me be able to press the tinplate.